Process ROL/ROR: rigorous testing
I am looking at the Reference Docs and it says clearly that there is ROL and ROR:
http://doc.kaitai.io/ksy_reference.html#process-rol

But the Python runtime has only ROL. Its not possible to use it with negative amount to simulate ROR.
https://github.com/kaitai-io/kaitai_struct_python_runtime/blob/master/kaitaistruct.py#L351
