[main, pipeline] Generalize to accept multiple TBB pipelines

Multiple pipelines are instantiated in parallel and managed by tbb's
group task concurrent scheduling interface.

A maximum number of supported pipelines is defined as a compilation
directive, but a new optional argument can take up to that maximum
number of active streams.

Each stream has its own configuration file.
The base name is passed as config and the files are assumed to follow
 the structure {basename}{i}.{baseformat}, unless no number of streams
 is provided. In that edge case, the config file is taken as-is and
 only one stream is opened.

Add a counter to InputFilter to tag log messages of each instance