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CPU Offload Algorithms (rebased)

Roel Aaij requested to merge raaij_dcampora_cpu_prefix_sum into master

Equivalent of !96 (closed) rebased on master

This MR adds an option to the sequence, --cpu-offload, that offloads part of the computation to the CPU. It is on by default. So far, this serves as a switch to run the following algorithms on the CPU:

  • Global event cut
  • Prefix sum
  • Copy and prefix sum

The GEC, when run on the CPU, produces results that are consistent between runs (ie. events are always selected in the same order). The prefix sum offload to the CPU results in a 5-10% speedup of the entire sequence.

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