Modify THcHodoscope.cxx and THcScintillatorPlane.cxx

 Eliminate temporary fStartTime=32. in  THcHodoscope::Decode
for   THcScintillatorPlane.cxx
Fix bug in CalcFpTime and set fpTime = -10000. in Clear
In CalcFptime changes for loop to use  fNScinGoodHits
In calcFptime if not a good hit ( both PMT within time window) set to -10000.
In Clear set fpTime=-10000.