[system-tools] XML <-> Gobject

[Tiago Cogumbreiro <cogumbreiro linus uac pt>]

I've finally completed the bridge between XML Relax NG Schema and
GObject. Now it is possible to import and export data seamlessly. I'm
sending in attach the generated GObjects.
I don't know if the lack of replies to my previous emails was it due to
the lack of time or lack of interest, anyway here they go.
I hope you find them useful.

Tiago Cogumbreiro