D-Meson hadronic decay redefinitions for EvtGen
add pythia8CommonSettingsBlock and pythia8CUEP8M1SettingsBlock to PythiaParameters
Merge pull request #6977 from jalimena/exoRelValFix

Fix for 3 exo relvals
Merge pull request #6974 from kurtejung/74X_EvtGenUpdate

D-Meson hadronic decay redefinitions for EvtGen
Merge remote branch 'origin/CMSSW_7_4_X' into CMSSW_7_0_X