Fix a memory leak in AudioLoader (AVPacket was not freed correctly)
Output original sample rate
Read json indent from profile file, return errors

main() now returns different codes for errors:
 1: essentia exception
 2: no mbid in source file if profile:requireMbid=true
wscript: output versions for all detected dependencies to config.log
Merge branch 'master' of https://github.com/MTG/essentia
Merge branch 'master' of github.com:MTG/essentia