bug fix to compute ES cluster shapes

[matteosan1]

Bug fix to EcalClusterTools to compute Preshower cluster shapes. Same as #6917 but for 74X.

[cmsbuild]

A new Pull Request was created by @matteosan1 (Matteo Sani) for CMSSW_7_4_X.

bug fix to compute ES cluster shapes

It involves the following packages:

RecoEcal/EgammaCoreTools

@cmsbuild, @nclopezo, @StoyanStoynev, @slava77 can you please review it and eventually sign? Thanks.
@Sam-Harper, @argiro, @lgray this is something you requested to watch as well.
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[cmsbuild]

+1
Tested at: 71297a8
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-6919/1622/summary.html

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-6919/1622/summary.html

[StoyanStoynev]

+1
For 71297a8.
I tested it on top of CMSSW_7_4_X_2014-12-14-0200. Short and extended matrix tests (including electron/photon wf) show no diffs. There are known false positives that can be seen in jenkins as well (EgOfflineHLT, Castor variables; also wf 25 is "dirty" - in past it was related to random seeds in simulation).
Related to #6917 and #6918.

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_7_4_X IBs unless changes (tests are also fine). This pull request will be automatically merged.