Select what does it capture

[JoaoFelipe]

Curently, it is possible to capture execution provenance at two granularities:

• Coarse-grained granularity (Profiler): function activations, parameters, globals, files
• Fine-grained granularity (Tracer): (Profiler) + variables values and dependencies between variables

It would be nice to have more freedom in selecting what to capture:

• I want to capture function activations using the Profiler, but skip capturing the files, since they can be too big
• I want to capture variable dependencies using the Tracer for program slicing, but skip capturing everthing else

[JoaoFelipe]

Some provenance could be optional. I don't need deployment provenance when I'm using noworkflow for debugging, for instance.

In addition, it should be possible to specify the serializer for objects. We have 3 on persistence/init.py:

• repr: default
• SimpleSerializer: avoids calling repr because some scripts implement it as non pure functions
• jsonpickle_content: use jsonpickle module, which is safer than repr, but slower