class HEDMdcWireManager: public TObject

 Helpers class to collect statistics
 about Mdc wires in the event.
 Usage:

 HEDMdcWireManager manager;
 manager.fill(); // for each event
 manager.isUsedNtimes(sec,mod,lay,cell)
 returns usage count of the wire
 (-1 if nothing filled,
   0 for existing cal object
  >0 used by segment (after fit)
 )

 loop over Mdc Cal1 cat and make a list of all
 wires in the current event. the initial count
 of the wire is set to 0

 loop over MdcSegment cat and count up
 each wire which has been used in segments.
 Non fitted wires are ignored.

 return how often a wire has been used
 in the event (by segment)
 fill() should be called before.
 returns usage count of the wire
 (-1 if nothing filled,
   0 for existing cal object
  >0 used by segment (after fit)
 )