Sync with 1.9.4

diff --combined Documentation/git.txt
index c15609face05c03d4d8ea2fd8a9af9700976a121,3d54378f275958b443a59023d965450542737dfd..b075e0bed55c9cfd84b130ef6e93080ef3207517
--- 1/Documentation/git.txt
--- 2/Documentation/git.txt
+++ b/Documentation/git.txt
@@@ -43,14 -43,10 +43,15 @@@ unreleased) version of Git, that is ava
  branch of the `git.git` repository.
  Documentation for older releases are available here:
  
- * link:v1.9.3/git.html[documentation for release 1.9.3]
 +* link:v2.0.0/git.html[documentation for release 2.0]
 +
 +* release notes for
 +  link:RelNotes/2.0.0.txt[2.0.0].
 +
+ * link:v1.9.4/git.html[documentation for release 1.9.4]
  
  * release notes for
+   link:RelNotes/1.9.4.txt[1.9.4],
    link:RelNotes/1.9.3.txt[1.9.3],
    link:RelNotes/1.9.2.txt[1.9.2],
    link:RelNotes/1.9.1.txt[1.9.1],
@@@ -728,11 -724,6 +729,11 @@@ Git so take care if using Cogito etc
        index file. If not specified, the default of `$GIT_DIR/index`
        is used.
  
 +'GIT_INDEX_VERSION'::
 +      This environment variable allows the specification of an index
 +      version for new repositories.  It won't affect existing index
 +      files.  By default index file version [23] is used.
 +
  'GIT_OBJECT_DIRECTORY'::
        If the object storage directory is specified via this
        environment variable then the sha1 directories are created