Cms hi/hydjet v1.9 implementation

[cbaus]

As discussed in mail exchange. This pull request updates the hydjet version to v1.9
It also adds the necessary configs (drum tune from 2013) and the new ones for 2015 conditions for PbPb.

[cmsbuild]

A new Pull Request was created by @cbaus for CMSSW_7_2_X.

Cms hi/hydjet v1.9 implementation

It involves the following packages:

Configuration/Generator
GeneratorInterface/HydjetInterface

@vciulli, @nclopezo, @thuer, @cmsbuild, @bendavid, @Degano can you please review it and eventually sign? Thanks.
@ghellwig this is something you requested to watch as well.
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[cmsbuild]

+1
Tested at: ac04c9d
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-4962/632/summary.html

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-4962/632/summary.html

[bendavid]

Hi @cbaus, even if the diff is ok now, the commit history is very confusing (contains unrelated commits which are reverted by later commits)

Suggest starting from a clean branch on top of 72x and pulling in the needed files.