Restructuring the Nix manual

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+<chapter xmlns="http://docbook.org/ns/docbook"
+      xmlns:xlink="http://www.w3.org/1999/xlink"
+      xmlns:xi="http://www.w3.org/2001/XInclude"
+      version="5.0"
+      xml:id="ssec-relnotes-1.6.1">
+
+<title>Release 1.6.1 (October 28, 2013)</title>
+
+<para>This is primarily a bug fix release.  Changes of interest
+are:</para>
+
+<itemizedlist>
+
+  <listitem>
+    <para>Nix 1.6 accidentally changed the semantics of antiquoted
+    paths in strings, such as <literal>"${/foo}/bar"</literal>.  This
+    release reverts to the Nix 1.5.3 behaviour.</para>
+  </listitem>
+
+  <listitem>
+    <para>Previously, Nix optimised expressions such as
+    <literal>"${<replaceable>expr</replaceable>}"</literal> to
+    <replaceable>expr</replaceable>.  Thus it neither checked whether
+    <replaceable>expr</replaceable> could be coerced to a string, nor
+    applied such coercions.  This meant that
+    <literal>"${123}"</literal> evaluatued to <literal>123</literal>,
+    and <literal>"${./foo}"</literal> evaluated to
+    <literal>./foo</literal> (even though
+    <literal>"${./foo} "</literal> evaluates to
+    <literal>"/nix/store/<replaceable>hash</replaceable>-foo "</literal>).
+    Nix now checks the type of antiquoted expressions and
+    applies coercions.</para>
+  </listitem>
+
+  <listitem>
+    <para>Nix now shows the exact position of undefined variables.  In
+    particular, undefined variable errors in a <literal>with</literal>
+    previously didn't show <emphasis>any</emphasis> position
+    information, so this makes it a lot easier to fix such
+    errors.</para>
+  </listitem>
+
+  <listitem>
+    <para>Undefined variables are now treated consistently.
+    Previously, the <function>tryEval</function> function would catch
+    undefined variables inside a <literal>with</literal> but not
+    outside.  Now <function>tryEval</function> never catches undefined
+    variables.</para>
+  </listitem>
+
+  <listitem>
+    <para>Bash completion in <command>nix-shell</command> now works
+    correctly.</para>
+  </listitem>
+
+  <listitem>
+    <para>Stack traces are less verbose: they no longer show calls to
+    builtin functions and only show a single line for each derivation
+    on the call stack.</para>
+  </listitem>
+
+  <listitem>
+    <para>New built-in function: <function>builtins.typeOf</function>,
+    which returns the type of its argument as a string.</para>
+  </listitem>
+
+</itemizedlist>
+
+</chapter>
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