* src/glade-app.c, src/glade-project.c, src/glade-command.c,
	  src/glade-widget.c:
	  Balanced out reference counts on GladeWidgets and their objects
	  so that closing a project doesnt leek objects.

	* src/glade-utils.c: Fixed pasting of toplevel widgets.

	* src/glade-gtk.c, src/glade-widget.[ch], src/glade-widget-class.[ch],
	  widgets/gtk+.xml:
	  - Removed concept of fill_empty functions, everything is done through
	    post_create.
	  - post_create now has a context specific arg `reason' (whether we are
	    creating from USER/COPY/LOAD); when reason is USER (i.e. the first
	    time it was created); then its time to do fill-empty work.

	* src/glade-editor.c: Reset dialog now doesnt use packing props (cause
	  it just doesn't make sence to), and now they dont show editor invisible
	  properties (that was a bug).