Add dc statistics parameters that can be used in reports.
Add gHcParm variables for some run information
    Added variables using ENGINE names
       gen_run_number
       gen_run_starting_event
       gen_event_id_number
Allow %d in report formats.
  If ThcAnalyzer::PrintReport sees a format descriptor with 'd' at
  the end, then the value is converted to the nearest int before formatting.
Add fThetaCentralOffset, fOopCentralOffset, fPCentralOffset
Add fTheta_lab
Do offsets in THcHallCSpectrometer::ReadDatabase
Merge pull request #22 from sawjlab/report_stuff

Report stuff
Merge branch 'develop' of github.com:JeffersonLab/hcana into mkj
Merge pull request #21 from MarkKJones/mkj

Add fThetaCentralOffset, fOopCentralOffset, fPCentralOffset