Generator FSR merging

Davide Fazzinirequested to merge
dfazzini-test-genFSR into 2016-patches
  • Add option to HltOutputConf to allow the GenFSR merging
  • Fix the FSR writing logic in HltOutputConf
  • Tests are covered by Moore!47 (merged)
  • See LHCBGAUSS-263

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