Bug#87929: rmgdiff cannot find mgdiff ; copyright for rmgdiff

[Paul Serice <paul@serice.net>]

Package: mgdiff
Version: 1.0-11

Recently, mgdiff and rmgdiff have been moved to /usr/bin from
/usr/X11R6/bin.  There is a shell script variable called
RMGDIFF_GUI in /usr/bin/rmgdiff that needs to be changed to
point to mgdiff's new location.

Also, I used to maintain mgdiff for Debian.  I wrote the rmgdiff
script.  You may want to add the following information to the
Copyright file for the sake of completeness:

      rmgdiff home page:  http://www.serice.net/rmgdiff/
      rmgdiff copyright: public domain

Thanks,
Paul Serice