Fixes to code in 62X
Merged development from repository mcepeda
loosen lhe header compatibility check given that random seeds and number of events may change from job to job for madevent and madspin
remove no-long-working workaround for amcatnlo event weights
add run script for amcatnlo tarballs
Merge pull request #2689 from bendavid/amcatnloprod

Generator fixes -- Changes to allow aMC@NLO production with ExternalLHEProducer
Merge pull request #2525 from cms-l1t-offline/rct-upgrade-activity-bit-62X

Trigger fixes -- Rct upgrade activity bit 62 x