[tests] remove __init__.py, use absolute imports
[tests] avoid some imports, move main to end
python/tests/test_filterbank*.py: clean-up, improve get_coeff tests
python/tests/: use local import, create __init__.py
python/tests: fix most prospect warnings
python/tests/test_filterbank.py: raise a ValueError
python/tests/test_filterbank.py: check for wrong values
python/ext/py-filterbank.c: check input size
python/tests/test_filterbank.py: fix indentation
python/tests/test_filterbank.py: clean up, use nose2
python/tests: use aubio.float_type
tests/: continue python3 preparation
tests/: array_from_file to look for file in tests/
python/tests/test_filterbank.py: added test against existing coeffs
tests/python/src/spectral/filterbank.py: replaced by python/tests/test_filterbank.py
moved tests to subdirectory