* app/edit_selection.c: removed some nonfunctional code.

	* app/paint_core.c: remove the alt toggles perfectmouse behaviour.

	* app/paintbrush.c: when ctl (or alt) is held set the fg (or bg) color.

	* app/gimpparasite.[ch]: made char *name parameters const.

	* app/parasitelist.c: removed unused static variable.

	* app/gimpdrawable.c, app/gimpimage.c, app/undo.[ch]: added
 	support for undoing parasite changes.

	* libgimp/gimp.h, libgimp/gimpimage.c: added
 	gimp_undo_push_group_start and gimp_undo_push_group_end

	* libgimp/parasite.[ch]: added undoable flag.

	* plug-ins/gdyntext/font_selection.c: fixed c++ style comment.

	* plug-ins/gdyntext/gdyntext.c: use the new undoable parasites.

	* plug-ins/rcm/rcm_misc.c: arctg can't be inline because it is
 	used in other .c files

	* plug-ins/waterselect/waterselect.c,
	* plug-ins/rotators/rotators.c, app/tips_dialog.c, app/plug_in.c:
 	fixed some warnings