Global muon refitter

as reported by Andrea Giammanco

tested with

cd CMSSW_7_1_0_pre9/src
git cms-addpkg FastSimulation/Configuration
scram b -j 8
edit FastSimulation/Configuration/python/CommonInputs_cff.py and set MixingMode = 'DigiRecoMixing' instead of 'GenMixing'

cmsDriver.py SingleMuPt10_cfi.py -s GEN,SIM,RECO --fast --pileup=mix_2012_Summer_inTimeOnly --conditions auto:startup_GRun --beamspot Realistic8TeVCollision --eventcontent=FEVTDEBUGHLT --datatier GEN-SIM-DIGI-RECO -n 10