Cherenkov class without any change in map and parameter files.
I deleted a line from the file: examples/PARAM/hcana.param. I wrote this line
just for test purpose.
An attempt to add Cherenkov class.
Undo testing changes.
  Remove link to engine
  Remove quick.csh script
  Undo changes to hodtest.C and hodtest_cuts.def
Remove incorrect Cherekov histogram definitions.
Add include of hcer.param to general.param.