Add OpenMP thread Nb var to config script + opt. override, Refs #2622
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Checked locally that the variable OMP_NUM_THREADSis set to 1 in all config scripts and CI macros in standard setup+compile -
Checked locally that defining OMP_NUM_THREADSin the env. leads to the value being used for all config scripts and macros instead of 1
Planned reviewer for "advanced OpenMP user" review: @fweig (cannot assign due to our role model)
Edited by Pierre-Alain Loizeau