2005-10-01  Simon Budig  <simon@gimp.org>

	* app/core/gimpcoords.[ch]: Added small utility function for the
	manhattan metric.

	* app/vectors/gimpstroke.[ch]: virtualized stubs provided by mitch

	* app/vectors/gimpbezierstroke.c: Reworked some internal functions
	to make it easier to access the parameters for the coordinates of an
	stroke interpolation. Simplified the straight line test. Added an
	implementation of the _nearest_tangent_get () function that does
	not yet seem to work properly. Not sure where the problem is.