Reduce fastsim memory profile a bit

[davidlange6]

reduce use of vectors for fixed length objects
close unneeded root files

I actually expected the memory changes to be more significant...still looking at bit into the topic.

[cmsbuild]

A new Pull Request was created by @davidlange6 (David Lange) for CMSSW_7_5_X.

Reduce fastsim memory profile a bit

It involves the following packages:

FastSimulation/CaloGeometryTools
FastSimulation/TrackingRecHitProducer
FastSimulation/Utilities

@cmsbuild, @ssekmen, @civanch, @mdhildreth, @lveldere can you please review it and eventually sign? Thanks.
@Martin-Grunewald, @matt-komm this is something you requested to watch as well.
You can sign-off by replying to this message having '+1' in the first line of your reply.
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@Degano you are the release manager for this.
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[lveldere]

please test

[cmsbuild]

The tests are being triggered in jenkins.

[cmsbuild]

-1
Tested at: 7eea81b
When I ran the RelVals I found an error in the following worklfows:
50202.0 step2

runTheMatrix-results/50202.0_TTbar_13+TTbar_13+DIGIUP15_PU50+RECOUP15_PU50+HARVESTUP15_PU50+MINIAODMCUP1550/step2_TTbar_13+TTbar_13+DIGIUP15_PU50+RECOUP15_PU50+HARVESTUP15_PU50+MINIAODMCUP1550.log
----- Begin Fatal Exception 04-Jun-2015 13:45:44 CEST-----------------------
An exception of category 'Configuration' occurred while
   [0] Processing run: 1 lumi: 1 event: 1
   [1] Running path 'digitisation_step'
   [2] Calling event method for module MixingModule/'mix'
Exception Message:
RootInputFileSequence::readOneRandom(): no input files specified for secondary input source.
----- End Fatal Exception -------------------------------------------------

you can see the results of the tests here:
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-9443/5270/summary.html

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-9443/2555/summary.html

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_7_5_X IBs unless changes (tests are also fine). This pull request requires discussion in the ORP meeting before it's merged. @davidlange6, @Degano, @smuzaffar

[davidlange6]

+1