HB radiation damage model

[kpedro88]

This commit introduces a radiation damage model for HB, based on a very rough extrapolation from the HE radiation damage model (as described in the comments of HBDarkening.cc). The associated recalibration is also introduced, using the same method as HE. The implementation includes a "scenario" parameter like the one recently introduced for HEDarkening, to allow for easy addition of HB scintillator replacement scenarios in the future. HB darkening currently is not turned on by default, but must be activated by manually adding set_HB_aging_scenario to the config file. (This may be changed in the near future).

This commit also fixes a small bug introduced in #3207 which assigned the wrong depth segmentation to towers 16 and 17 when calculating the HE recalibration. The effect of this bug on aging simulations would have been negligible.

[cmsbuild]

A new Pull Request was created by @kpedro88 (Kevin Pedro) for CMSSW_6_2_X_SLHC.

HB radiation damage model

It involves the following packages:

CalibCalorimetry/HcalPlugins
DataFormats/HcalCalibObjects
SLHCUpgradeSimulations/Configuration
SimCalorimetry/HcalSimProducers
SimG4CMS/Calo
SimG4Core/Application

@civanch, @nclopezo, @mdhildreth, @cmsbuild, @diguida, @rcastello, @cerminar, @mmusich can you please review it and eventually sign? Thanks.
@makortel this is something you requested to watch as well.
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@fratnikov, @mark-grimes you are the release manager for this.
You can merge this pull request by typing 'merge' in the first line of your comment.

[mark-grimes]

I think this line is causing very bizarre crashes in several workflows. Gen-Sim is crashing right at the end of the job, I'd post the stacktrace but I think it's irrelevant.
Since m_HBDarkening is not set to zero at the start, if ageingFlagHB is not used then this will delete a random section of memory.
I have a fix ready, I'll test and then put in a new pull request.

[mark-grimes]

Superseded by #6175. Please close and move the discussion there (if not this should close automatically when #6175 is merged).