zwgc libnotify port

[andersk-auto]

Completely blue sky idea, let zwgc also be able to pop little
things in the corner.

[andersk-auto]

Imported from trac issue 15. Created by kcr@ATHENA.MIT.EDU on 2009-03-30T19:45:18, last modified: 2009-03-30T19:49:46