git.el: Added functions for moving to the next/prev unmerged file.
git.el: Added functions for moving to the next/prev unmerged file.

This is useful when doing a merge that changes many files with only a
few conflicts here and there.

Signed-off-by: Alexandre Julliard <a3c1c71ac0d85b781251f68481a696b8e4d0781d@winehq.org>
Signed-off-by: Junio C Hamano <dc50d1021234060e53ec42a77d526afa2fe07479@cox.net>

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git