merge(third_party/git): Merge squashed git subtree at v2.23.0 r/373

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+Release 1.5.0
+=============
+
+Backward-incompatible change
+----------------------------
+
+The name of classes for environment was misnamed as `*Environement`.
+It is now `*Environment`.
+
+New features
+------------
+
+* A Thread-Index header is now added to each email sent (except for
+  combined emails where it would not make sense), so that MS Outlook
+  properly groups messages by threads even though they have a
+  different subject line. Unfortunately, even adding this header the
+  threading still seems to be unreliable, but it is unclear whether
+  this is an issue on our side or on MS Outlook's side (see discussion
+  here: https://github.com/git-multimail/git-multimail/pull/194).
+
+* A new variable multimailhook.ExcludeMergeRevisions was added to send
+  notification emails only for non-merge commits.
+
+* For gitolite environment, it is now possible to specify the mail map
+  in a separate file in addition to gitolite.conf, using the variable
+  multimailhook.MailaddressMap.
+
+Internal changes
+----------------
+
+* The testsuite now uses GIT_PRINT_SHA1_ELLIPSIS where needed for
+  compatibility with recent Git versions. Only tests are affected.
+
+* We don't try to install pyflakes in the continuous integration job
+  for old Python versions where it's no longer available.
+
+* Stop using the deprecated cgi.escape in Python 3.
+
+* New flake8 warnings have been fixed.
+
+* Python 3.6 is now tested against on Travis-CI.
+
+* A bunch of lgtm.com warnings have been fixed.
+
+Bug fixes
+---------
+
+* SMTPMailer logs in only once now. It used to re-login for each email
+  sent which triggered errors for some SMTP servers.
+
+* migrate-mailhook-config was broken by internal refactoring, it
+  should now work again.
+
+This version was tested with Python 2.6 to 3.7. It was tested with Git
+1.7.10.406.gdc801, 2.15.1 and 2.20.1.98.gecbdaf0.
+
+Release 1.4.0
+=============
+
+New features to troubleshoot a git-multimail installation
+---------------------------------------------------------
+
+* One can now perform a basic check of git-multimail's setup by
+  running the hook with the environment variable
+  GIT_MULTIMAIL_CHECK_SETUP set to a non-empty string. See
+  doc/troubleshooting.rst for details.
+
+* A new log files system was added. See the multimailhook.logFile,
+  multimailhook.errorLogFile and multimailhook.debugLogFile variables.
+
+* git_multimail.py can now be made more verbose using
+  multimailhook.verbose.
+
+* A new option --check-ref-filter is now available to help debugging
+  the refFilter* options.
+
+Formatting emails
+-----------------
+
+* Formatting of emails was made slightly more compact, to reduce the
+  odds of having long subject lines truncated or wrapped in short list
+  of commits.
+
+* multimailhook.emailPrefix may now use the '%(repo_shortname)s'
+  placeholder for the repository's short name.
+
+* A new option multimailhook.subjectMaxLength is available to truncate
+  overly long subject lines.
+
+Bug fixes and minor changes
+---------------------------
+
+* Options refFilterDoSendRegex and refFilterDontSendRegex were
+  essentially broken. They should work now.
+
+* The behavior when both refFilter{Do,Dont}SendRegex and
+  refFilter{Exclusion,Inclusion}Regex are set have been slightly
+  changed. Exclusion/Inclusion is now strictly stronger than
+  DoSend/DontSend.
+
+* The management of precedence when a setting can be computed in
+  multiple ways has been considerably refactored and modified.
+  multimailhook.from and multimailhook.reponame now have precedence
+  over the environment-specific settings ($GL_REPO/$GL_USER for
+  gitolite, --stash-user/repo for Stash, --submitter/--project for
+  Gerrit).
+
+* The coverage of the testsuite has been considerably improved. All
+  configuration variables now appear at least once in the testsuite.
+
+This version was tested with Python 2.6 to 3.5. It also mostly works
+with Python 2.4, but there is one known breakage in the testsuite
+related to non-ascii characters. It was tested with Git
+1.7.10.406.gdc801, 1.8.5.6, 2.1.4, and 2.10.0.rc0.1.g07c9292.
+
+Release 1.3.1 (bugfix-only release)
+===================================
+
+* Generate links to commits in combined emails (it was done only for
+  commit emails in 1.3.0).
+
+* Fix broken links on PyPi.
+
+Release 1.3.0
+=============
+
+* New options multimailhook.htmlInIntro and multimailhook.htmlInFooter
+  now allow using HTML in the introduction and footer of emails (e.g.
+  for a more pleasant formatting or to insert a link to the commit on
+  a web interface).
+
+* A new option multimailhook.commitBrowseURL gives a simpler (and less
+  flexible) way to add a link to a web interface for commit emails
+  than multimailhook.htmlInIntro and multimailhook.htmlInFooter.
+
+* A new public function config.add_config_parameters was added to
+  allow custom hooks to set specific Git configuration variables
+  without modifying the configuration files. See an example in
+  post-receive.example.
+
+* Error handling for SMTP has been improved (we used to print Python
+  backtraces for legitimate errors).
+
+* The SMTP mailer can now check TLS certificates when the newly added
+  configuration variable multimailhook.smtpCACerts.
+
+* Python 3 portability has been improved.
+
+* The documentation's formatting has been improved.
+
+* The testsuite has been improved (we now use pyflakes to check for
+  errors in the code).
+
+This version has been tested with Python 2.4 and 2.6 to 3.5, and Git
+v1.7.10-406-gdc801e7, 2.1.4 and 2.8.1.339.g3ad15fd.
+
+No change since 1.3 RC1.
+
+Release 1.2.0
+=============
+
+* It is now possible to exclude some refs (e.g. exclude some branches
+  or tags). See refFilterDoSendRegex, refFilterDontSendRegex,
+  refFilterInclusionRegex and refFilterExclusionRegex.
+
+* New commitEmailFormat option which can be set to "html" to generate
+  simple colorized diffs using HTML for the commit emails.
+
+* git-multimail can now be ran as a Gerrit ref-updated hook, or from
+  Atlassian BitBucket Server (formerly known as Atlassian Stash).
+
+* The From: field is now more customizeable. It can be set
+  independently for refchange emails and commit emails (see
+  fromCommit, fromRefChange). The special values pusher and author can
+  be used in these configuration variable.
+
+* A new command-line option, --version, was added. The version is also
+  available in the X-Git-Multimail-Version header of sent emails.
+
+* Set X-Git-NotificationType header to differentiate the various types
+  of notifications. Current values are: diff, ref_changed_plus_diff,
+  ref_changed.
+
+* Preliminary support for Python 3. The testsuite passes with Python 3,
+  but it has not received as much testing as the Python 2 version yet.
+
+* Several encoding-related fixes. UTF-8 characters work in more
+  situations (but non-ascii characters in email address are still not
+  supported).
+
+* The testsuite and its documentation has been greatly improved.
+
+Plus all the bugfixes from version 1.1.1.
+
+This version has been tested with Python 2.4 and 2.6 to 3.5, and Git
+v1.7.10-406-gdc801e7, git-1.8.2.3 and 2.6.0. Git versions prior to
+v1.7.10-406-gdc801e7 probably work, but cannot run the testsuite
+properly.
+
+Release 1.1.1 (bugfix-only release)
+===================================
+
+* The SMTP mailer was not working with Python 2.4.
+
+Release 1.1.0
+=============
+
+* When a single commit is pushed, omit the reference changed email.
+  Set multimailhook.combineWhenSingleCommit to false to disable this
+  new feature.
+
+* In gitolite environments, the pusher's email address can be used as
+  the From address by creating a specially formatted comment block in
+  gitolite.conf (see multimailhook.from in README).
+
+* Support for SMTP authentication and SSL/TLS encryption was added,
+  see smtpUser, smtpPass, smtpEncryption in README.
+
+* A new option scanCommitForCc was added to allow git-multimail to
+  search the commit message for 'Cc: ...' lines, and add the
+  corresponding emails in Cc.
+
+* If $USER is not set, use the variable $USERNAME. This is needed on
+  Windows platform to recognize the pusher.
+
+* The emailPrefix variable can now be set to an empty string to remove
+  the prefix.
+
+* A short tutorial was added in doc/gitolite.rst to set up
+  git-multimail with gitolite.
+
+* The post-receive file was renamed to post-receive.example. It has
+  always been an example (the standard way to call git-multimail is to
+  call git_multimail.py), but it was unclear to many users.
+
+* A new refchangeShowGraph option was added to make it possible to
+  include both a graph and a log in the summary emails.  The options
+  to control the graph formatting can be set via the new graphOpts
+  option.
+
+* New option --force-send was added to disable new commit detection
+  for update hook. One use-case is to run git_multimail.py after
+  running "git fetch" to send emails about commits that have just been
+  fetched (the detection of new commits was unreliable in this mode).
+
+* The testing infrastructure was considerably improved (continuous
+  integration with travis-ci, automatic check of PEP8 and RST syntax,
+  many improvements to the test scripts).
+
+This version has been tested with Python 2.4 to 2.7, and Git 1.7.1 to
+2.4.
+
+Release 1.0.0
+=============
+
+* Fix encoding of non-ASCII email addresses in email headers.
+
+* Fix backwards-compatibility bugs for older Python 2.x versions.
+
+* Fix a backwards-compatibility bug for Git 1.7.1.
+
+* Add an option commitDiffOpts to customize logs for revisions.
+
+* Pass "-oi" to sendmail by default to prevent premature termination
+  on a line containing only ".".
+
+* Stagger email "Date:" values in an attempt to help mail clients
+  thread the emails in the right order.
+
+* If a mailing list setting is missing, just skip sending the
+  corresponding email (with a warning) instead of failing.
+
+* Add a X-Git-Host header that can be used for email filtering.
+
+* Allow the sender's fully-qualified domain name to be configured.
+
+* Minor documentation improvements.
+
+* Add this CHANGES file.
+
+
+Release 0.9.0
+=============
+
+* Initial release.