Removed mutable from DigiCollectionFP420

Removed mutables from DigiCollectionFP420 by using std::map::find
instead of std::map::operator[]. The code in question was not dependent
upon the default value being placed in the map, it only wanted to
see if a value was available. This avoids warning messages from the
static analyzer.
removed unnecessary mutables from PixelDigiCollection

The previous code was using std::map::operator[] in places where
it could use std::map::find to get the same results. Switching
to find allowed the removal of the mutables. These mutables were
causing warnings from the static analyzer and would have lead to
crashes in the threaded framework.
TauConeSize and HLT Script Fixes
Merged refs/pull/3445/head from repository cms-sw
Small Fixes
TRemoval of obsolete file
Fix
Merge pull request #3445 from Martin-Grunewald/ScriptAndTauConeFixes

HLTrigger/Configuration -- TauConeSize and HLT Script Fixes
Merge pull request #3441 from Dr15Jones/removeUnneededMutableFromPixelDigiCollection

Multithreading -- Removed unnecessary mutables from PixelDigiCollection
Merge pull request #3440 from Dr15Jones/removeUnneededMutableFromDigiCollectionFP420

Multithreading -- Removed mutable from DigiCollectionFP420
Merge remote branch 'origin/CMSSW_7_1_X' into CMSSW_7_0_X