fix cmsShowFF crash -- root 5.34.18 & new ServiRegistry interface

[alja]

In root 5.34.18 gStyle has been auto-destructed due to aggressive clean-up in ~TApplication. This change contains a workaround for this problem.

ServiceRegistry interface has been changed and this PR also contains adaptation to it.

[cmsbuild]

A new Pull Request was created by @alja (Alja Mrak-Tadel) for CMSSW_7_1_X.

New service registry71

It involves the following packages:

Fireworks/Eve
Fireworks/FWInterface
Fireworks/Geometry

@Dr15Jones, @cmsbuild, @alja, @nclopezo, @Degano, @ktf 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, @ktf you are the release manager for this.
You can merge this pull request by typing 'merge' in the first line of your comment.

[alja]

+1

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_7_1_X IBs unless changes or unless it breaks tests. @nclopezo, @ktf can you please take care of it?

[alja]

Problem was reported by @arizzi

[cmsbuild]

+1
Tested at: 7532dc7
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-4458/1774/summary.html

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_7_1_X IBs unless changes (tests are also fine). @nclopezo, @ktf can you please take care of it?

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-4458/1774/summary.html

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_7_1_X IBs unless changes (tests are also fine). @nclopezo, @ktf can you please take care of it?