Reimplement TrigMonTHitSvc without inheritance of THistSvc
Remove the inheritance of Gaudi's THistSvc
as very little code from the
base class was actually re-used. And in order to implement the
inheritance we had to maintain a copy of the THistSvc
source files in
this package. So any fixes in the Gaudi repository anyway had to be
ported by hand to our version.
Other changes: