Lhe interface update for pythia 8.205 (71x)

[bendavid]

Must be merged together with pythia 8.205 in cmsdist

[cmsbuild]

A new Pull Request was created by @bendavid (Josh Bendavid) for CMSSW_7_1_X.

Lhe interface update for pythia 8.205 (71x)

It involves the following packages:

Configuration/Generator
GeneratorInterface/Pythia8Interface

@vciulli, @covarell, @thuer, @cmsbuild, @nclopezo, @bendavid can you please review it and eventually sign? Thanks.
@ghellwig, @Martin-Grunewald this is something you requested to watch as well.
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@Degano you are the release manager for this.
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[bendavid]

+1

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_7_1_X IBs unless changes or unless it breaks tests. This pull request requires discussion in the ORP meeting before it's merged. @davidlange6, @Degano, @ktf, @smuzaffar