2003-10-10  Michael Natterer  <mitch@gimp.org>

	Cleaned up session management and changed the format of sessionrc
	in a way that allows extensions without changing the format during
	the 2.0 cycle:

	* app/widgets/Makefile.am
	* app/widgets/widgets-types.h
	* app/widgets/gimpsessioninfo.[ch]: new files implementing the whole
	GimpSessionInfo stuff (parsing, saving, restoring, utility functions).
	Save / parse the position of GimpDock's panes (bug #122964).

	* app/widgets/gimpdialogfactory.[ch]: removed saving, restoring
	and session related utility functions and use the ones from
	the new files above.

	* app/gui/session.c: removed parsing and use the new stuff.

	* app/widgets/gimpdock.[ch]: added new virtual functions
	GimpDock::set_aux_info() and GimpDock::get_aux_info():

	* app/widgets/gimpimagedock.c: implement them and handle the
	"auto_follow_active" and "show_image_menu" properties.

	* app/widgets/gimpdockable.[ch]: added the same virtual functions
	to the GimpDockable class. Enables forward-compatible per-dockable
	session management (bug #122964).

	* app/gui/dialogs-commands.c
	* app/gui/gui.c: changed accordingly.

	* etc/sessionrc: ditto. Look at this file and update your own
	sessionrc manually if you don't want to lose it.