more support for the HT (etsum) hypo

The HT hypo uses C++ AlgTool  TrigJetHypoToolHelperMT, condigured by
the C++ AlgTool TrigJetHypoToolConfig

The hypo filters single jets, then applies athe cut sim sum_i(et_i)
where the sum is over the remaining jets.

HT files:

   ConditionsToolSetterHT.py
   TrigJetConditionConfig_ht.cxx, h
   TrigJetHypoToolConfig_ht.cxx, h
   HTConditionMT.cxx

Modified non-ht specific files:

	 TrigJetHypoToolConfig.py
	 - formatting changes
	 - HT support

	 chainDict2jetLabel.py
	 - improve debug output
	 - HT support

	 testChainDictMaker.py
	 - HT support
	 - python 3 style print

	 treeVisitors.py
	 - HT support

	 TrigJetHypoToolHelperMT.h
	 - set default values for some Gaudi proporties

	 TrigHLTJetHypo_entries.cxx
	 - HT support