src/onset/onset.c: clean up set_threshold function
src/onset/onset.c: add get_threshold
src/onset/onset.c: default depends on hop_size, not samplerate
src/pitch/pitchyin.h: add direct link to article
python/tests/test_onset.py: improve
python/tests/test_phasevoc.py: improve
python/scripts/aubiocut: add minioi option
src/spectral/phasevoc.c: improve, accept that hop_s == buf_s
src/spectral/phasevoc.c: compute start, end, scale, and memory sizes only once
examples/parse_args.h: enable hop_size == buffer_size