automatic binding.

added the *_corner() routines to rectangle and drectangle and made these
objects constructable from instances of each other.

their first element.

conversions are attempted.

and convert_image_scaled() to the python API.

parameters were given.

randomly_color_image(), jet(), skeleton(), find_line_endpoints(), get_rect(), shrink_rect(),
grow_rect(), and image_gradients.

improved the way overload resolution works in pybind11 for these objects.

large matrices can be handled on windows.

for remove_incoherent_edge_pixels().