Modernize HistoDef

• remove virtual function destructor, qualify as final
• implement binary operator as friend functions
• implement less than using std::tie

• [2017-11-13 00:03] Validation started with lhcb-future#600
• [2017-11-13 00:04] Validation started with lhcb-future-clang#374
• [2017-11-13 08:05] Validation started with lhcb-gaudi-merge#292

added 1 commit

• a7dfca4c - Modernize HistoDef

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approved this merge request

changed milestone to %v30r0

assigned to @hegner

merged

mentioned in commit ebdff2ca

added C++ framework label