update to 2.2.0
changes:
-migrated from libgnomeprint/gnomecanvas to gtk/cairo
-UI improvements
-support more barcodes
-Added shadow attribute to label objects
-New merge backend for evolution data server
-Various bug fixes
-New templates

pkgsrc note: I've made evolution-data-server support an option as done
at other places. Default to "on" as elsewhere -- I'm not so sure about this
because glabels doesn't depend on other gnome-desktop features, but
I didn't want to introduce another inconsistency.

(drochner)