def farthest_point_in_path(pt, path):
return path.radialrange(pt)[<NUM_LIT:1>]<EOL>
returns (|path.seg.point(t)-pt|, t, seg_idx) where t and seg_idx
    maximize the distance between pt and curve path[idx].point(t) for 0<=t<=1
    and any seg_idx.
    :rtype : object
    :param pt:
    :param path:
    Warning:  Multiple such global maxima can exist.  This will only return
    one.