Pull request #572: CAS-13713 do not override OpenMP configuration
Merge in CASA/casa6 from CAS-13713 to master
* commit '22a3bba8911dc8e82b1dfde77b3dbe6b8c6293f9': (21 commits) CAS-13713 skip OpenMP tests on macOS CAS-13713 bug fix on environment_variable_manager CAS-13713 renaming variables CAS-13713 properly handle the case that OMP_NUM_THREADS is zero CAS-13713 refactoring pattern matching CAS-13713 refinement of assertion CAS-13713 define variable to hold OMP_NUM_THREADS value as int CAS-13713 add test for unsetting OMP_NUM_THREADS CAS-13713 replace print statement with casalog.post CAS-13713 bug fix on regex CAS-13713 turning precondition into assertion CAS-13713 correct handling of environment variable CAS-13713 put assertion out of if block CAS-13713 grammatical fix CAS-13713 added supplementary comment on default value, -1, for nthreads CAS-13713 add test for OMP_NUM_THREADS env var. CAS-13713 more fix on omp parallelization CAS-13713 respect numThreads_ CAS-13713 respect OMP_NUM_THREADS environment variable CAS-13713 do not call omp_set_num_threads()
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