fix for tangent curve flipping only doing 2d angle tests.


git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk/blender@56043 954f8c5b-7b00-dc11-b283-0030488c597c
correct pyapi function intersect_line_sphere_2d() using 3d vecs when only 2d are needed.


git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk/blender@56044 954f8c5b-7b00-dc11-b283-0030488c597c