removing pixel saturation for heb

[pfs]

Relaxing constraint on max. number of pixels in BH which implied a saturation after digitisation.
The previous constraint was bound to the CALICE test beam benchmark.

@vandreev11 As just agreed.
@lgray

[cmsbuild]

A new Pull Request was created by @pfs (Pedro Silva) for CMSSW_6_2_X_SLHC.

removing pixel saturation for heb

It involves the following packages:

SimGeneral/MixingModule

@cmsbuild, @civanch, @nclopezo, @mdhildreth 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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[mark-grimes]

merge

As with #8187 we'll get this in the 14:00 IB and then test with the updated pandora external. If there are problems we can fix or revert then.