CMSSW_9_3_18

Changes since CMSSW_9_3_17:

compare to previous

1. 29153 from @pasmuss: Changing handling of color indexes and anti particle creation for pythia8 EGun (9_3_X backport) generators created: 2020-03-09 16:00:23 merged: 2020-03-10 08:24:37

2. 29106 from @swertz: Fix obvious bug in particle boosting - backport of PR #25412 in 9_3_X generators created: 2020-03-05 10:15:23 merged: 2020-03-06 16:43:51

CMSDIST Changes between Tags REL/CMSSW_9_3_17/slc6_amd64_gcc630 and REL/CMSSW_9_3_18/slc6_amd64_gcc630:

compare to previous

1. 5569 from @cms-sw: [9.3.X][FrontierClient] Update to verison 2.9.0 created: 2020-02-18 16:53:54 merged: 2020-02-27 09:44:40