Clean-up of plots per path and duplications
clean up of plots
removing commented code lines
Allow different LHE headers in one job
Improved migration script.

  * Creates different output files automatically per account/GT
    imported and in a different folder (timestamp).

  * Checks for the CalledProcessError exception.
Merge pull request #2903 from ojeda/migrate-script

DB -- Improved migration script (for 71X)
Merge pull request #2859 from wmtan/AllowDifferentLHEHeadersInOneJob

Generators -- Allow different lhe headers in one job
Merge pull request #2865 from arcidiac/mydev

DQM -- General HLT DQM plots clean up
Merge remote branch 'origin/CMSSW_7_1_X' into CMSSW_7_0_X