initial commit for refactor of pyfasst
doc, refactor in action

probably broken at the moment of writing... WIP
refactor in action, FASST not working so well anymore

changes in estim_params_a_posteriori seem to have broken something.
Needs a revert?
solved issue with refactored estim_params_a_posteriori

there was a dtype=np.complex issue again. Solved it, program working as
before again (seemingly). more tests are needed.
Merge branch 'master' of https://github.com/wslihgt/pyfasst