2004-08-22  Sven Neumann  <sven@gimp.org>

	* app/tools/Makefile.am
	* app/tools/tools-utils.[ch]: added gimp_tool_motion_constrain(),

	* app/paint/gimppaintcore.[ch]: removed gimp_paint_core_constrain().

	* app/tools/gimppainttool.c: changed accordingly.

	* app/tools/gimpblendtool.[ch]: use gimp_tool_motion_constrain()
	instead of duplicating that functionality.

	* app/tools/gimpmeasuretool.c: use gimp_tool_motion_constrain()
	instead of implementing completely different constraints.