move to v3 of hf library for 71x

[davidlange6]

moving to new and improved v3 of hf shower libraries

[cmsbuild]

A new Pull Request was created by @davidlange6 (David Lange) for CMSSW_7_1_X.

move to v3 of hf library for 71x

It involves the following packages:

SLHCUpgradeSimulations/Configuration
SimG4Core/Application

@cmsbuild, @civanch, @nclopezo, @mdhildreth can you please review it and eventually sign? Thanks.
@Martin-Grunewald, @makortel 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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