Reduce south logging during tests by setting level to INFO
Use assertEqual instead of assert in coincidences tests

Also PEP8 fixes
Improve histogram tests

Skip multithreaded tests, they do not seem to finishes properly
Reduce output:
Disable progressbar with mock.patch
Redirect stdout/err to devnull
Set histograms logger level to INFO
Increase coincidence window for ESD to 2000 ns