Reorganized loops so that when na == nb there is only one inner loop.  Made omp simd reduction explicit.  Moved normalization factor out of inner loop to reduce number of floating operations.
Reorganized loops so that when na == nb there is only one inner loop.  Made omp simd reduction explicit.  Moved normalization factor out of inner loop to reduce number of floating operations.

bakerb845/libiscl,bakerb845/libiscl