tests/src/io/test-source_seek.c: add source_seek test
src/io/source.h: add source_multi example
src/io/source_apple_audio.c: add _open and _close
src/io/source_apple_audio.c: reset mDataByteSize in case of short read
tests/src/io/test-source_seek.c: add simple test, read() / seek(0) / read()
src/io/utils_apple_audio.c: use AUBIO_ARRAY / AUBIO_FREE
src/synth/sampler.c: fix _do_multi
Merge branch 'synth' into develop
tests/src/synth/test-sampler.c: shorter frames, repeat three times
src/io/source_apple_audio.c: copy data to missing channels
src/io/source_apple_audio.c: simplify buffer creation, reset size on seek
wscript: always use installed external dependancies, simplify
wscript: improve help messages