custom fragments for SIM step are improved

[civanch]

It is forward port of minor fix of custom fragments - they are enabled only if g4SimHits exist. Russian roulette parameters are tuned according the most recent validation results and are not compatible with 7_0_X. No change in regular runs.

[cmsbuild]

A new Pull Request was created by @civanch (Vladimir Ivantchenko) for CMSSW_6_2_X.

custom fragments for SIM step are improved

It involves the following packages:

SimG4Core/Application

@cmsbuild, @civanch, @Degano, @mdhildreth, @nclopezo can you please review it and eventually sign? Thanks.
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@Degano you are the release manager for this.
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[civanch]

+1

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_6_2_X IBs unless changes or unless it breaks tests. @Degano can you please take care of it?

[cmsbuild]

+1
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-2225/33/summary.html

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_6_2_X IBs unless changes (tests are also fine). @Degano can you please take care of it?

[davidlange6]

+1