* Allow choosing the OpenMP scheduler and add range hint for GEMM_MULTITHREAD_THRESHOLD * Amended description of GEMM_MULTITHREAD_THRESHOLD to reflect #742 making it track floating point operations rather than matrix size
* Allow choosing the OpenMP scheduler and add range hint for GEMM_MULTITHREAD_THRESHOLD * Amended description of GEMM_MULTITHREAD_THRESHOLD to reflect #742 making it track floating point operations rather than matrix size