* gtk/DestroyHelper.cs : implement an internal DestroyNotify handler to release GCHandles. * gtk/*.custom : rework existing persistent delegate implementations to use destroy notify or PersistentData. svn path=/trunk/gtk-sharp/; revision=42571
* gtk/TreeModelFilter.custom : manually implement SetVisibleFunc and SetModifyFunc to handle delegate persistence. * gtk/Gtk.metadata : hide methods. svn path=/trunk/gtk-sharp/; revision=42471
is now tracking Gnome 2.6. svn path=/trunk/gtk-sharp/; revision=35479