Further Progress on s2p_Adaptor Test-benching

Testbench now generates most of the signals required to test, but  the
output is not at all correct...
This is what we expected however.... At least we can now hopefully see
better what is wrong with the code...
Little progress made on s2p_adapter

Tried regressing back to code more like the original template but not
helping... Still think I'm on the right track, stopping for the night
now...