bnspeech: remove per-file data/test/audio, the clips travel as a tar per split

bnspeech: data

bnspeech: data (part 9)

bnspeech: data (part 8)

bnspeech: data (part 7)

bnspeech: data (part 6)

bnspeech: data (part 5)

bnspeech: data (part 4)

bnspeech: data (part 3)

bnspeech: data (part 2)

bnspeech: data