new pkgtreediff tool

Hi, I made a little tool called pkgtreediff to compare package trees
(directories of rpm files).
See <a href="" title=""></a> for more details.
I hope some people here may find it useful.

Fedora and Epel7 builds are available in <>.

Feedback and suggestions are welcome (particularly other than "why did you
write in Haskell again?";-)

Thanks, Jens