Backport of cut based disriminator to SLHC branch

[jpavel]

Backporting the discriminator added to 71x via #3671 to SLHC and adding it to the sequence (so that it is being run by default)

[cmsbuild]

A new Pull Request was created by @jpavel (Pavel Jez) for CMSSW_6_2_X_SLHC.

Backport of cut based disriminator to SLHC branch

It involves the following packages:

PhysicsTools/PatAlgos
RecoTauTag/Configuration
RecoTauTag/RecoTau

@nclopezo, @monttj, @cmsbuild, @anton-a, @thspeer, @slava77, @vadler, @Degano can you please review it and eventually sign? Thanks.
@TaiSakuma, @nhanvtran this is something you requested to watch as well.
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@andersonjacob, @mark-grimes you are the release manager for this.
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[vadler]

+1
Trivial for AT.

[andersonjacob]

merge

passes the tests which pass