Updat of some HLT filters for Egamma paths entering in 73X

- dZ filter adapted to work with RecoEcalCandidates (HLTrigger/filters)
- Added a templated and more general version of PFMT filter (HLTrigger/Egamma)
- Added FED producer for Single Electron path to be used in the ECAL calibration stream (Calibration/EcalAlCaRecoProducers)
- Updated Filter to to perform the selection in regions of pseudo rapidity for the barrel and endcap in pi0/eta calibration paths (HLTrigger/special)
Can't be done this way:
teh behaviour of the module must not depend on whether a parameetr is present or
not, but only on its value. fillDescriptions ensures a value is provided (the one used
in fillDescriptions) in case it is missing. That value should be so as to reproduce
the old behaviour.