VERSION: bump to 0.4.1~alpha

Signed-off-by: Paul Brossier <piem@piem.org>
Merge branch 'master' into develop
doc/*.cfg: bump version numbers to 0.4.1~alpha here too

Signed-off-by: Paul Brossier <piem@piem.org>
Merge branch 'master' of aubio.org:/git/aubio/aubio into develop
src/io/source_sndfile.c: fix resampled position in _seek
src/io/source_sndfile.c: fix resampled position in _seek, improve test for non integer ratios
src/io/source_avcodec.c: add _seek
tests/src/io/test-source_seek.c: improve seek to half
src/spectral/ooura_fft8g.c: use float when double is not needed
python/demos/demo_mfcc.py: remove unused variables
python/tests/test_zero_crossing_rate.py: clean up, chmod +x
src/spectral/phasevoc.c: optimize swapbuffers by using memcpy
src/io/source_avcodec.c: no errors if not sample given, may happen in some resampling configurations
examples/aubioonset.c: synth only when need be
examples/aubiopitch.c: synth only when need be
examples/aubiotrack.c: synth only when need be
wscript: variadic functions should be optional
src/lvec.c: add missing lvec_set_sample, improve test
tests/: add void to prototypes to build with -Wstrict-prototypes
src/onset/peakpicker.c: add void to build with -Wold-style-definition