AlCa cleanups -- Interpolation log errors only once per channel.

[argiro]

With certain GT, the error stream was flooded by errors due to laser corrections interpolation. With this fix, errors are logged at most once per channel. Replaces #259

[cmsbuild]

A new Pull Request was created by @argiro for CMSSW_7_0_X.

log interpolation errors only once per channel, thread safe. Replaces #259

It involves the following packages:

CalibCalorimetry/EcalLaserCorrection

@demattia, @rcastello can you please review it and eventually sign? Thanks.
You can sign-off by replying to this message having '+1' in the first line of your reply.
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[nclopezo]

Hi

I ran the tests on top of CMSSW_7_0_X_2013-09-02-0200, all tests passed

The logs are here:
https://cmssdt.cern.ch/jenkins/job/Pull-Request-Integration/ARCHITECTURE=slc5_amd64_gcc472/373/consoleFull

and the artifacts here:

https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/373/

[Dr15Jones]

@argiro I want to say 'thank you' to Stefano for being patient enough to get a thread safe version implemented.

[argiro]

@Dr15Jones oh no, please, thank you for the opportunity to explore tbb, C++11 and this (complicated) new world !

[ktf]

@demattia @rcastello can you check this?

[ktf]

ping?

[rcastello]

+1

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next IBs unless changes or unless it breaks tests. @ktf can you please take care of it?