hodoscope start time calculation. verified against the engine output.
Merge branch 'gabbys' of github.com:gabbyn/hcana into gaby
  Removed not yet ready THcHodoscope::CalcBeta while merging.
Eliminate temporary fStartTime=32. in Decode
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.
Updated drift chamber debug messages
add flags debugflagpr and debugflagstubs
add method THcDC::PrintStubs
modify THcDC::PrintSpacePoints
Set THcDC::LinkStubs() to only set fNDCTracks=0 and retrun when
  fNDCTracks>10 for HMS style chambers to match engine.