Patch D133: Python wrapper for BLI_kdtree (adds mathutils.kdtree)

Originally by Dan Eicher, with my own fixes and adjustments (see patch page for details).

For details there are unit tests and api example usage.

	doc/python_api/sphinx-in-tmp/menu_id.png

source/blender/python/intern/bpy_interface.c

@@ -213,6 +213,7 @@ static struct _inittab bpy_internal_modules[] = {
 	{(char *)"mathutils", PyInit_mathutils},
 //	{(char *)"mathutils.geometry", PyInit_mathutils_geometry},
 //	{(char *)"mathutils.noise", PyInit_mathutils_noise},
+//	{(char *)"mathutils.kdtree", PyInit_mathutils_kdtree},
 	{(char *)"_bpy_path", BPyInit__bpy_path},
 	{(char *)"bgl", BPyInit_bgl},
 	{(char *)"blf", BPyInit_blf},