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Bugfix: do not manually set new OpenLoops and loader paths for all Powheg processes, only ttbb

Stefan Richter requested to merge powhegcontrol_add_stj_process into 21.6

In order to get the ttbb process to run @tpelzer had implemented a manual setting of some paths via environment variables. However, this was done in the body of a module that gets imported for ALL PowhegControl processes and was thus executed for all of them. This is not the desired behaviour. The present MR encapsulates the behaviour in a function and ensures that it's only used when the ttbb process is run.

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