[Pianod] Groups test

[Perette Barella]

I've added the fixes for group handling, but having trouble testing them... It looks like 'id' returns what's on file (as opposed to what's recorded in the process).  Can someone give this a test and let me know?
	http://deviousfish.com/Downloads/pianod/Devel/pianod-test.tar.gz

The -n nobody user's GID is always used for the primary group.  A new -g <group list> provides supplementary groups; if not given, the supplementary groups are looked up.

Perette