Log Message:
Changes 1.8.1.2:
* 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.
* When users spelled "cc:" in lowercase in the fake "header" \ 
in the
  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.