[PATCH] Gitk Inotify support

Hi
Is this correct to send possible gitk patches here? or should I send
them to Paul Mackerras somehow?

Anyway I just wanted that gitk automatically updates while I'm working
in my terminal

Are you interrested?

as described in "SubmittingPatches" this patch is based on
git://ozlabs.org/~paulus/gitk   22a713c72df8b6799c59287c50cee44c4a6db51e

The code should be robust to just don't autoupdate if
https://sourceforge.net/projects/tcl-inotify/ is not installed

Open points for now:
 - release watches for deleted directories seems to cause problems in
tcl-inotify (so I don't)
   I'm not sure how often that happens in ".git/"
 - I only call "updatecommits" and I don't know if there is a usecase
where I should be calling "reloadcommits"

Regards
Florian Schüller