Remove uses of input sources that no longer exist.

[wmtan]

I discovered that there are a large number of python config files that cannot possibly be run because the input sources used no longer exist. In particular, most of the generators were changed from sources to producers three years ago, and the old source classes were removed almost three years ago (Nov 2012). I am working on a generator feature that requires looking at a lot of config files that use generators, so it will make life easier if these obsolete config files that cannot possibly be used are removed from the release. The few changes to files not removed in this PR are trivial, namely removing or fixing obsolete comments or message wording.
This PR removes over 5500 source lines from CMSSW!

[cmsbuild]

A new Pull Request was created by @wmtan for CMSSW_7_6_X.

Remove uses of input sources that no longer exist.

It involves the following packages:

CalibTracker/SiPixelErrorEstimation
CommonTools/CandAlgos
CommonTools/ParticleFlow
Configuration/Generator
Configuration/JetMET
Configuration/SVSuite
DQM/SiStripMonitorCluster
FastSimulation/CaloGeometryTools
FastSimulation/Configuration
FastSimulation/ForwardDetectors
FastSimulation/MaterialEffects
FastSimulation/MuonSimHitProducer
FastSimulation/Tracking
FastSimulation/Validation
GeneratorInterface/CosmicMuonGenerator
GeneratorInterface/GenExtensions
GeneratorInterface/GenFilters
GeneratorInterface/Herwig6Interface
GeneratorInterface/LHEInterface
Geometry/HcalCommonData
Geometry/TrackerCommonData
L1Trigger/RegionalCaloTrigger
PhysicsTools/Configuration
PhysicsTools/HepMCCandAlgos
PhysicsTools/JetMCAlgos
PhysicsTools/RooStatsCms
RecoParticleFlow/PFClusterTools
RecoRomanPot/RecoFP420
RecoTauTag/TauTagTools
SLHCUpgradeSimulations/Geometry
SimCalorimetry/EcalSimProducers
SimG4CMS/CherenkovAnalysis
SimG4CMS/ShowerLibraryProducer
SimG4CMS/Tracker
SimG4Core/CustomPhysics
SimG4Core/GFlash
SimG4Core/KillSecondaries
SimG4Core/PhysicsLists
SimRomanPot/SimFP420
SimTracker/TrackerFilters
SimTracker/TrackerMaterialAnalysis
Validation/EcalDigis
Validation/EcalRecHits
Validation/GlobalHits
Validation/MuonHits
Validation/RecoParticleFlow

@diguida, @lveldere, @ianna, @cerminar, @covarell, @bendavid, @civanch, @cmsbuild, @vciulli, @smuzaffar, @Dr15Jones, @cvuosalo, @mdhildreth, @deguio, @slava77, @vadler, @mmusich, @mulhearn, @ssekmen, @danduggan, @thuer, @monttj can you please review it and eventually sign? Thanks.
@ghellwig, @rappoccio, @argiro, @Martin-Grunewald, @threus, @venturia, @mmarionncern, @imarches, @makortel, @acaudron, @lgray, @jdolen, @ferencek, @cerati, @GiacomoSguazzoni, @rovere, @VinInn, @dgulhan, @mkirsano, @ahinzmann, @dkotlins, @matt-komm, @pvmulder, @bachtis this is something you requested to watch as well.
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[diguida]

please test

[cmsbuild]

The tests are being triggered in jenkins.