DGEMM with both operands transposed improved
improved DSYRK further
mods to DGEMM for trans times no-trans.
created fill_lower routine in array.c, initially with same code as before
more elaborate version of fill_lower
Revert "more elaborate version of fill_lower"

This reverts commit 89e57a2cf2274bee60b6f4c2cb37067e9b231a8a.
Revert "created fill_lower routine in array.c, initially with same code as before"

This reverts commit d35a53c0345b8d4ec0822ac84f3afb91cd07698a.
Merge branch '14-blas-opt' into 15-task-merging
look at MAT_MULT_WITH_BLAS_IN_HELPERS_OK for complex matmult
Merge branch '14-misc-cleanup' into 15-task-merging