hooks: for python hooks, consistently use __name__ etc as name, not the repr...
hooks: for python hooks, consistently use __name__ etc as name, not the repr
There is no reason to expose unnecessary Python implementation details and
memory locations, also not in debug mode.
readablefunc was already creating a nice name - we move that functionality
up and reuse it.
We consider having a __call__ and being types.FunctionType sufficiently
similar and unify these two to just using the existing check for __call__.