WIP Fixed missing creation of TESMerger<LHCb::Track> typedef in Kernel/LHCbAlgs/src/TESMerger.cpp

@cattanem, this fixes many tests in DaVinci with stderr such as

File "/workspace/build/LHCB/LHCB_HEAD/InstallArea/x86_64-slc6-gcc7-opt/python/GaudiConf/TurboConf.py", line 300, in __apply_configuration__ self._register_pr_links(packing, rootintes, datatype, simulation) File "/workspace/build/LHCB/LHCB_HEAD/InstallArea/x86_64-slc6-gcc7-opt/python/GaudiConf/TurboConf.py", line 81, in _register_pr_links from Configurables import TESMerger_LHCb__Track_ as TESMergerTrack ImportError: cannot import name TESMerger_LHCb__Track_,

see for example DaVinciTests.davinci.davinci_turbo_implicit in https://lhcb-nightlies.cern.ch/logs/tests/nightly/lhcb-head/2007/x86_64-slc6-gcc7-opt/DaVinci/.