[PATCH 0/3] Core GIT fixes and additions.

Pasky,
        I am sending you three patches rediffed against the tip
of git-pb tree for inclusion.

  * [PATCH 1/3] Introduce "rev-list --stop-at=<commit>".
  * [PATCH 2/3] Support symlinks in git-ls-files --others.
  * [PATCH 3/3] Add git-ls-files -k.

The first one is independent from other two.  3/3 touches the
same file as 2/3.