Python API documentation updates: a description of class hierarchy

was added to the docstrings of most Python extension types.

source/blender/freestyle/intern/python/UnaryPredicate1D/BPy_ExternalContourUP1D.cpp

@@ -9,6 +9,8 @@ extern "C" {
 //------------------------INSTANCE METHODS ----------------------------------
 
 static char ExternalContourUP1D___doc__[] =
+"Class hierarchy: :class:`UnaryPredicate1D` > :class:`ExternalContourUP1D`\n"
+"\n"
 ".. method:: __call__(inter)\n"
 "\n"
 "   Returns true if the Interface1D is an external contour.  An\n"