linsalrob/PhiSpy: Improvements to repeatfinder

In this release we internalize repeatfinder to become a python external module that we have renamed PhiSpyRepeatFinder as there are many other modules called RepeatFinder out there. The C++ code is now directly called from the Python code, removing the need for some confusing temporary files. We have also initiated the availability of PhiSpy through PyPi by adding setup.py