reorganize HCAL aging functions

[kpedro88]

This commit reorganizes the HCAL aging functions to separate the aging customizations for HB, HE, HF, and SiPMs. Important notes:

• The default behavior of the function ageHcal remains unchanged (HB aging is not enabled by default).
• Several pre-defined function snippets are added to change the HE aging scenarios easily via the cmsDriver --customise command: turn_on_HE_aging_X for scenario X (currently 1, 2, or 3).
• SiPM aging can now be separately disabled.

[cmsbuild]

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

reorganize HCAL aging functions

It involves the following packages:

CalibCalorimetry/HcalPlugins
SLHCUpgradeSimulations/Configuration

@civanch, @nclopezo, @mdhildreth, @cmsbuild, @diguida, @rcastello, @cerminar, @mmusich can you please review it and eventually sign? Thanks.
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@fratnikov, @mark-grimes you are the release manager for this.
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[fratnikov]

merge