Switch to optimised PandoraPFA

[mark-grimes]

Should cut down event time from ~hour per event to ~13 minutes (apparently) when using PanoraPFA for HGCal reconstruction.

[cmsbuild]

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

Switch to optimised PandoraPFA

It involves the following packages:

RecoParticleFlow/PandoraTranslator

The following packages do not have a category, yet:

RecoParticleFlow/PandoraTranslator

@cmsbuild, @nclopezo can you please review it and eventually sign? Thanks.
@mmarionncern, @bachtis, @lgray 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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[mark-grimes]

merge

Didn't bother running the tests, none of them use Pandora. I've got a private job running so I know it works, went from 88 to 15 minutes for the first event.