- the parameters to crop() weren't handled correctly in most

    - the parameters to crop() weren't handled correctly in most
          cases other than supplying left,top,right,bottom.
        - clarified the documentation for crop() providing more detail
          and more examples
        - the edges of the cropped area are now cropped against the
          edges of the source image
        - cropping to zero width/height is treated as an error (no
          image is returned and $src->errstr has a message)
          Resolves https://rt.cpan.org/Ticket/Display.html?id=7581
        - built 0.43_01 for testing