Control for debug mode

[JBludau]

I just wanted to document my thoughts on things I would want to have fine grained control over when debugging. So ideally I would want to be able to do something like pk.settings.clang-format = True I would wish for the following:

• en/disable clang format on the cpp files
• specify which clang-format excutable to use
• en/disable that the translation of the funktor/workunit is done again every time it is called
• en/disable that the compilation is done every time regardless of existing .so files
• en/disable the compilation of a debug version of the cpp code
• en/disable bounds checking on primitive types like int etc.
• en/disable printing of type information that is passed into the cpp calls
• en/disable the caching of workunit arguments

please feel free to add anything you like