Partial fulfilment of ATR-20700 - reporting events passing jet hypo by leg

Further development towards ATR-20700 This MR replaces !38707 (closed) @bossio @valente @khoo @tamartin @peter

Trigger/TrigHypothesis/TrigHLTJetHypo/TrigHLTJetHypo/TrigHLTJetHypoUtils/AllJetsGrouper.h

 /*
-  Copyright (C) 2002-2019 CERN for the benefit of the ATLAS collaboration
+  Copyright (C) 2002-2020 CERN for the benefit of the ATLAS collaboration
 */
 
 #ifndef TRIGHLTJETHYPO_ALLJETSGROUPER_H
@@ -9,12 +9,21 @@
 
 class AllJetsGrouper: public IJetGrouper{
  public:
+  AllJetsGrouper();
+  AllJetsGrouper(const HypoJetIter& b, const HypoJetIter& e);
+  AllJetsGrouper(const HypoJetVector&);
+  
   std::vector<HypoJetGroupVector> group(HypoJetIter&,
 					HypoJetIter&) const override;
   
-  std::optional<HypoJetGroupVector> next(HypoJetIter&,
-					 HypoJetIter&) const override;
+  std::optional<HypoJetGroupVector> next();
+  
   std::string getName() const override; 
   std::string toString() const override;
+
+private:
+  HypoJetVector m_jets{};
+  bool m_done{false};
+
 };
 #endif