Set random seed when running a simulation

Up to now the ROOT random number generator was always initialised with the same default value. In some cases this gives strange results when doing large scale simulations with several jobs. To solve the problem TRandom is now initialised with the value 0 which uses a seed value based on the system time with a granularity of 100ns. This granularity should be good enough to have different seed values even if several jobs start a similar times on the batch farm. A setter was added to allow to set the seed value explicitly from a macro, refs #1395, #2066

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• 33e5be00 - Apply clang-format

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Dear @f.uhlig, @v.friese, @p.-a.loizeau,

you have been identified as code owner of at least one file which was changed with this merge request.

Please check the changes and approve them or request changes.

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• 33e5be00...fc8ed615 - 7 commits from branch computing:master
• ff6717fe - Set random seed when running a simulation
• c43cb3b3 - Apply clang-format

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@v.friese, @p.-a.loizeau,

could you please check the merge request and comment.

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