Overlay transform using ComponentAccumulator

Tadej Novakrequested to merge
tadej/athena:overlay/trf into master

This MR adds the overlay transform using ComponentAccumulator. For now only MC+MC overlay is fully supported and tested (ART tests updated).

The following features are supported:

  • detector selection using a string (also backported to the legacy skeleton)
  • pre/postExec support: preExec mainly to override flags, postExec as usual
  • preInclude not supported
  • postInclude supported - defining additional accumulators to be merged (see accFromFragment)

Legacy and new CA-based transforms are fully reproducible using compatible configurations.

/cc @jchapman @wlampl

Edited by Tadej Novak

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