make no L1 postLS1 customizations beyond new menu if Fast Simulation detected
Add new L1Emulation sequence to all paths with simGctDigis, switch l1extra to sim or unpacked digis based on context
remove legacy simGctDigis from upgrade L1T emulation
fix python crash when no L1 simulation but customs called
remove some commented lines
Merge pull request #6597 from cms-l1t-offline/l1t-run-l1t-famos-bugfix-730

L1t run l1t famos bugfix 730
Merge remote branch 'origin/CMSSW_7_3_X' into CMSSW_7_0_X