Decoder FileDecoder : Fixes #8 buy providing a 'stack' argument at the FileDecoder initialization. It removes the previous changes doing this at the pipe level and using an ArrrayDecoder
timeside/analyzer/core.py: unrevert 945d739d, Fixes #26
Fix no output_file for yaml and numpy analyzer serializers
Decoder: Add a abstract base class for Decoders
Merge branch 'dev' into diadems
Analyzer:IRITMusicLDN : Fix analyzer ID to avoid duplicated id