Higgs: delete unused DPD packages

Frank Winklmeierrequested to merge
fwinkl/athena:higgs_delete into master

Delete the following obsolete DPD-related Higgs packages and a few other files relying on them:

  • HiggsD3PDMaker
  • HSG2Event
  • HSG5DPDUtils (was already disabled in build)
  • HSG1DPDUtils
  • HSG1AnalysisCommon (only one script)

cc @kkoeneke in the unlikely case any of this is still relevant.

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