prepare for 130503
Adding c++ code for calculating weighted isolation
adding customization for running weighted isolation
fixed printouts
Optimization suggested by Stoyan
Complete implementation of 130503 maps
Merge pull request #5269 from namapane/MF-130503

MagneticField -- Mf 130503
Merge pull request #5255 from cms-tau-pog/720p5_tau_weightedIso

RecoTauTag -- Adding optional PU weighted neutral isolation to tau ID
Merge remote branch 'origin/CMSSW_7_2_X' into CMSSW_7_0_X