2001-03-31  Michael Natterer  <mitch@gimp.org>

	* app/undo.c: re-enabled transform undo. Fixes the transform tool
	crashes.

	* app/tools/gimptool.[ch]: put tool->ID back because the undo
	system uses it. Also, a unique tool serial number will be not too
	bad to have once we have module tools.

	* app/tools/gimptransformtool.[ch]: changed accordingly.