Cleanup for a from scratch step-wise development
Added a working version of PDL only PUF. No ALU.
Tested after re-formatting the UCF file.
Half bits from challenge, half from config. working.
Interconnect network added. Working.
Inputnetwork added. Working.
Cleanup in modules. Working.
Integrated with Challenge gen hierarchy and instantiation. Working.

Not a complete integration though.
Partial integration: Mode checking, Response choosing. Working.

Checks about which mode to run in, from data sent from pc. In calib. mode both config and challenge will be sent from PC. In normal mode, pdl config will be using but challenge will be from onchip generator.
Challenge choosing to be done. Response choosing done : calib. - raw puf responses. test - siam's modules response.