1) THcTrigDet
   a) Modify code to use string vector fTrigNames to identify which of the trigger
     trigger detector TDC signals to use for coincidence timing. This
      replaces the hard-coded names. The integer array fTrigId[4] keeps
     track of the array ID in the overall fTDcNames vector that goes
      with the fTrigNames[4]
   b) The fTrigNames must be in order of SHMS ROC1, HMS ROC1, SHMS ROC2
     and HMS ROC2.
   c) Default names are "pTRIG1_ROC1","pTRIG4_ROC1","pTRIG1_ROC2","pTRIG4_ROC2"
      The parameter is t_coin_trigNames
      For example:
      t_coin_trigNames="pTRIG1_ROC1 pTRIG4_ROC1 pTRIG1_ROC2 pTRIG4_ROC2"
      This parameter is read-in and the split into a string vector fTrigNames.
   d) In HcTrigDet::ReadDatabase , all members of fTrigID array are set
to -1 then a loop over all Tdc in the trigger detector looks for match between
fTdcNames amd fTrigNames to set fTrigId. If match not found the fTrigId = -1.
   e) In THcTrigDet.h made new method Get_CT_TrigTime(Int_t ii) to be used
in in THcCoinTime to get the 4 trigger times: SHMS ROC1 (ii=0), HMS ROC1 (ii=1),
SHMS ROC2 (ii=2) and HMS ROC2 (ii=3).  If fTrigId[ii]=0 then it returns 0
otherwise returns fTdcTime[fTrigID[ii]].

2) THcCoinTime
  a) Previously used the raw trigger times and had a hard-coded 0.1 ns/channel
conversion. Now use the trigger times which already are in ns using the
ns/channel conversion set in the TrigDet.
  b) Now use the new TrgiDet method Get_CT_TrigTime(ii) to get the
trigger times for SHMS ROC1, HMS ROC1, SHMS ROC2 and HMS ROC2.