[gnome-db] Removed warnings from libgnomedb

[Gonzalo Paniagua Javier <gonzalo gnome-db org>]

	Hi!

	I removed all the warnings from libgnomedb.
	I'm sending the patch and the list of warnings removed.
	There's only one important: in gnome-data-source-selector.c
	(forgotten '(object)' after parent_class->finalize).

	If everything is ok, I'll commit.

	Cheers!