src/onset/onset.h: add examples to documentation
src/tempo/tempo.h: add examples to documentation
src/pitch/pitch.c: add aliases for freq (hertz, Hz, and f0)
src/pitch/pitchyinfft.h: remove reference to pitchyin.c
src/pitch/pitch.h: improve documentation, adding a description of each method
examples/aubiopitch.c: set default buffer_size to 2048
examples/aubio{trac,onset}.c: add silence option
examples/parse_args.h: move some options down
.gitignore: update doxygen generated file location
src/io/source_apple_audio.h: improve documentation
python/scripts/aubiocut: sync option names with examples/
doc/: rewrite manpages, use txt2man, add aubioquiet.txt, change rule in wscript
src/io/source.h: add a note about the different libraries
examples/: define aubio_process_func_t once in utils.h