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Details: - When requesting multithreaded parallelism by specifying the total number of threads (whether it be via environment variable, globally at runtime, or locally at runtime), reduce the number of threads actually used by one if the original value (a) is prime and (b) exceeds a minimum threshold defined by the macro BLIS_NT_MAX_PRIME, which is set to 11 by default. If, when specifying the total number of threads (and not the individual ways of parallelism for each loop), prime numbers of threads are desired, this feature may be overridden by defining the BLIS_ENABLE_AUTO_PRIME_NUM_THREADS macro in the bli_family_*.h that corresponds to the configuration family targeted at configure-time. (For now, there is no configure option(s) to control this feature.) Thanks to Jeff Diamond for suggesting this change. - Defined a new function in bli_thread.c, bli_is_prime(), that returns a bool that determines whether an integer is prime. This function is implemented in terms of existing functions in bli_thread.c. - Updated docs/Multithreading.md to document the above feature, along with unrelated minor edits.