grapher: PIL modules by default
README.rst: fix typos
timeside/static: remove executable bit
Add New Metadata fields (data, idMetadata, audioMetadata, frameMetadata, labelMetadata, parameters) structure to be included in AnalyzerResult
Add new structure for the analyzerResult + Add Analyzer generic processor

Add a new structure to handle the different kind of metadata :
 - data
 - idMetadata
 - audioMetadata
 - frameMetadata
 - labelMetadata
 - parameters

Automatic setting of some metadata is providing through a generic Analyzer processor class from which the common analyzer derives.

Modifiy setup() parameters for all processors to diffenriate between source_* parameter and input_*, output_* parameters for the non-source processors