git-gui: Start file status display refactoring.
git-gui: Start file status display refactoring.

I'm going to refactor the way file status information gets displayed
so it more closely aligns with the way 'git-runstatus' displays the
differences between HEAD<->index and index<->working directory.  To
that end the other file list is going to be changed to be the working
directory difference.  So this change renames it.

Signed-off-by: Shawn O. Pearce <f01032651c12a22b2103346ba96b3b6b231f9d3c@spearce.org>

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