GDL: Rebase on upstream commit 2648F (2010-10-26)
Merge upstream GDL: GNOME_2_30_0
Remove deprecated glib macro wrappers
Add handling of focus tabbing for GdlDockItem + various DockItem focus fixes.
Dockable dialogs patch applied (https://sourceforge.net/tracker/?func=detail&atid=604308&aid=1688508&group_id=93438)