automatically support all DQMStore book* calls in the IBooker
DQMStore: avoid cloning MonitorElements that are not going to be merged
updated file for testing to include MET plot
Merge pull request #1934 from fwyzard/IBooker_variadic_calls

DQM cleanup -- Automatically support all DQMStore book* calls in the IBooker
Merge pull request #1938 from fwyzard/DQMStore_avoid_cloning_unused_MEs

DQM fixes -- DQMStore: avoid cloning MonitorElements that are not going to be merged
Merge pull request #1973 from borrello/addMETPlotinPFlow

DQM fixes -- Updated file for testing to include MET plot