Log Message:
Changes 2.3.5:
* The prompt script (in contrib/) did not show the untracked sign
  when working in a subdirectory without any untracked files.

* Even though "git grep --quiet" is run merely to ask for the exit
  status, we spawned the pager regardless.  Stop doing that.

* Recommend format-patch and send-email for those who want to submit
  patches to this project.

* An failure early in the "git clone" that started creating the
  working tree and repository could have resulted in some directories
  and files left without getting cleaned up.

* "git fetch" that fetches a commit using the allow-tip-sha1-in-want
  extension could have failed to fetch all the requested refs.

* The split-index mode introduced at v2.3.0-rc0~41 was broken in the
  codepath to protect us against a broken reimplementation of Git
  that writes an invalid index with duplicated index entries, etc.

* "git prune" used to largely ignore broken refs when deciding which
  objects are still being used, which could spread an existing small
  damage and make it a larger one.

* "git tag -h" used to show the "--column" and \ 
"--sort" options
  that are about listing in a wrong section.

* The transfer.hiderefs support did not quite work for smart-http
  transport.

* The code that reads from the ctags file in the completion script
  (in contrib/) did not spell ${param/pattern/string} substitution
  correctly, which happened to work with bash but not with zsh.

* The explanation on "rebase --preserve-merges", "pull \ 
--rebase=preserve",
  and "push --force-with-lease" in the documentation was unclear.