Fix typo which caused the arrow plots to be not produced.
Updated PFlowDQM
create skimmed events
create skimmed events
create skimmed events
create skimmed events
create skimmed events
create skimmed events
getByToken switch
getByToken switch
getByToken switch completed
PFRootEvent compatible
Add plots for PFlowDQM
Added new Service signals to watch for a delayed get from the Event.

Timing based services want to know if a module has requested data from the Event and this request then spawns a delayed get either by running an unscheduled EDProducer or causing a delayed read from the Source. This change adds two new signals to the ActivityRegistry for this purpose: preModuleEventDelayedGetSignal_ and postModuleEventDelayedGetSignal_. At the moment we only need signals for Event requests since they are the only ones which can be delayed. Also, delayed file reads caused by objects like edm::Ref do not trigger this signal because the requisite ModuleCallingContext is not available from that call since the call directly accesses the edm::EventPrincipal and not the edm::Event.
Thanks go to Andrea Bocci for noticing the need for these signals.
Declare statics const when they are constant
Changed class statics to const member data to fix thread-safety issues

The thread-safety checker complained about the non-const statics which
were being used to hold configuration information. These were easily
changed to const member data instead.
Fixed merge conflicts

Similar changes where already done to fix the statics. However,
I prefer this solutions since I was able to make the member data
const which more clearly states their purpose.
adjust to new interface, remove obsolete externals
Merge pull request #1193 from Dr15Jones/fixStaticsRecoLocalMuonDTRecHit

Multithreading fixes -- Changed class statics to const member data to fix thread-safety issues
propagate the change in Tracer parameter dumpContextForLabels to the configurations using it