Increase Method2 overlapping pulse limit

[mark-grimes]

Increases the criterion for deciding whether two (or three) pulses are overlapping or not. I think it would be better to have this user configurable but there will be a review of this fit code in the next few days anyway.

The reason for choosing 10 ns is discussed on #7174 with a plot.

@sabrandt, @hengne

[mark-grimes]

merge

Skipping tests for trivial change

[cmsbuild]

A new Pull Request was created by @mark-grimes (Mark Grimes) for CMSSW_6_2_X_SLHC.

Increase Method2 overlapping pulse limit

It involves the following packages:

RecoLocalCalo/HcalRecAlgos

@cmsbuild, @cvuosalo, @nclopezo, @slava77 can you please review it and eventually sign? Thanks.
@argiro this is something you requested to watch as well.
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@fratnikov, @mark-grimes you are the release manager for this.
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