Merge branch 'dev/AvalancheSchedProps' into 'master'

GaudiHive/options/AtlasMCRecoScenario.py

GaudiHive/options/AvalancheSchedulerSimpleTest.py

GaudiHive/options/BrunelScenarioAvalancheScheduler.py

GaudiHive/options/SequentialAlgSequencerTest.py

GaudiHive/src/AlgResourcePool.cpp

GaudiHive/src/AvalancheSchedulerSvc.cpp

GaudiHive/src/AvalancheSchedulerSvc.h

GaudiHive/src/ForwardSchedulerSvc.cpp

GaudiHive/src/ForwardSchedulerSvc.h

GaudiHive/src/PrecedenceRulesGraph.cpp

GaudiHive/src/PrecedenceRulesGraph.h