Fixes for Gaudi::Functional not using GaudiAlg

Marco Clemencic requested to merge fixes-for-changes-in-GaudiAlg into master

This is a backward compatible change needed to prepare for gaudi/Gaudi!1444 (merged).

  • explicitly include Gaudi/Accumulators.h
  • use GaudiAlgorithm explicitly where needed
  • adapt for the change of header file for PyAlg

Part of a set of independent MRs: !3395 (merged) Allen!1193 (merged) Analysis!975 (merged) Boole!466 (merged) LHCb!4082 (merged)

Edited by Marco Clemencic

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