make ParticleTable singleton threadsafe
revert rechit producers to old style producers because of HcalChannelQuality
switch to sentry + thread_local
try again
add sentry to MuonSimHitProducer
Merge pull request #3809 from lgray/fastsim_pf_threading_issues

Fastsim/PF threading issues
Work around signed / unsigned mismatch
Merge pull request #3889 from ktf/fix-type-mismatch

L1: Work around signed / unsigned mismatch
Merge remote branch 'origin/CMSSW_7_1_X' into CMSSW_7_0_X