introduce the DQMEDHarvester as an edm::one:EDAnalyzer
implement access to the iBooker in the endRun and set streamId=0 and moduleId=0
move the DQM examples to the new interfaces (no getter implemented yet for the harvesting)
IGetter class implemented in DQMStore.h
implementation of the getter to be passed along the booker to the harvesting module: implemented and tested
support more syntaxes through the iGetter interface
DQMGenericClient migrated to the DQMEDHarvester interface. fixed the DQMExample to run the operation in the endJob
removed iostream from DQMStore
removing useless mutex from the bookTransaction method used by the harvesting modules
add the possibility of getting histos in the endLumi
fixes as suggested by Marco
modify the file saver to save in the endJob by default
Merge pull request #3281 from deguio/harvestingInterface

DQMServices -- Harvesting interface