Make it an error to set multiple threads if NEST was built without thread support #2658
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Until now, setting more than one thread if NEST was built without thread support resulted only in a warning. This led to a considerable number of tests being run in a meaningless way, and potentially causing problems in MPI-based test.
This PR makes it an error to try to set more that one local thread if NEST was built without thread support. The PR also ensures that all tests requiring multiple threads are skipped.