Hcal DQM Migration - II.2

This should complete the HCAL DQM migration to MT framework. This affects DQM/HcalMonitorClient and DQM/HcalMonitorTasks. The use of helper classes inheriting from a common base class made it dificult to trace for every case the functional flow of the monitors and clients. However, with the exception of the removal of endRun(void) methods in HcalBaseDQClient and its derivatives, the functionality is intended to be the same in both frameworks.