Modified HcTrigDet::Init , Decode and ReadDatabase

In HcTrigDet::Init moved InitHitList after gHcDetectorMap->FillMap so that the refindex can be filled for the trigger TDC modules
In ReadDatabase add parameters fTdcOffset and fTdcChanperNS
In Decode set fTdcTime[cnt] = rawTdcHit.GetTime()*fTdcChanperNS-fTdcOffset
Ths makes the time into a positive number wiht units of ns
Need to add the parameter to either thms.param or tshms.param or
it will use defaults of 0.1 and 300.
Need to eventually get the fTdcChanperNS from event 125.