Sync with 1.8.1.2

Documentation/RelNotes/1.8.1.2.txt

@@ -4,6 +4,16 @@ Git 1.8.1.2 Release Notes
 Fixes since v1.8.1.1
 --------------------
 
+ * An element on GIT_CEILING_DIRECTORIES list that does not name the
+   real path to a directory (i.e. a symbolic link) could have caused
+   the GIT_DIR discovery logic to escape the ceiling.
+
+ * Command line completion for "tcsh" emitted an unwanted space
+   after completing a single directory name.
+
+ * Command line completion leaked an unnecessary error message while
+   looking for possible matches with paths in <tree-ish>.
+
  * "git archive" did not record uncompressed size in the header when
    streaming a zip archive, which confused some implementations of unzip.
 
@@ -11,3 +21,5 @@ Fixes since v1.8.1.1
    trailer part, "git send-email" failed to pick up the addresses from
    there. As e-mail headers field names are case insensitive, this
    script should follow suit and treat "cc:" and "Cc:" the same way.
+
+Also contains various documentation fixes.