2005-09-21  Michael Natterer  <mitch@gimp.org>

	Separated the global buffer logic from the clipboard
	implementation:

	* app/widgets/gimpclipboard.[ch]: removed all knowledge about
	gimp->global_buffer. Removed the Gimp::buffer-changed callback.
	Made gimp_clipboard_set_buffer() public and remember the set
	buffer in the GimpClipboard struct. Fixed the has_buffer() and
	has_svg() functions.

	* app/gui/gui.c: connect to Gimp::buffer-changed here and call
	gimp_clipboard_set_buffer() from the callback.