MAKE pypi:  only one setup.py call
FIX ClusterDist:  unpickling backwards compatibility
DOC:  main documentation filenames
DOC:  AMD
DOC:  note on unpicking from earlier Eelbrain versions
DOC:  Factor.isin()
ENH MneExperiment.load_test():  make kwarg
API MneExperiment.load_test():  test arg