Improve calculation of leg labels

Leg labels are of thoe form leg\d\d\d_<chainame. the \d\d\d comes is the position of the
chainPart in the chainDict['chainParts'] list. It is calculated when setting up the jet chainlabel
string. Postpending the chain name is now done in TrigJetHypoTool, just before reporting passing jets.

remove chain name  from ToolSetters:
       python/ConditionsToolSetterFastReduction.py
       python/ConditionsToolSetterHT.py
       python/TrigJetHypoToolConfig.py
       src/TrigJetHypoToolMT.h

Tidy the cut and pasting of trigJetTLAHypoToolFromDict from trigJetHypoToolFromDict:
      python/TrigJetHypoToolConfig.py

Add leg labels to jet chain labels where missing
    python/chainDict2jetLabel.py
    src/SingleConditionMatcherMT.cxx

Remove obsolete code, adapt to the removals:
       src/PartitionsGroupsMatcherMT.cxx, h
       src/groupsMatcherFactoryMT.cxx, h

Modify jet collecting, adapt jet collector clients:
       src/TrigJetHypoToolMT.cxx
       src/xAODJetCollector.cxx, h