MMULT dimensions

Hi,

MMULT has

| Portable Constraints: Both matrices must have the same dimensions.

and

| TODO: We should probably instead REQUIRE support for matrix
| multiplication when they don't have the same dimentions.

How was that meant? Matrix multiplication is defined for
columns()==rows(), the two matrices don't need to have the same
dimensions. So the portable constraint is moot.

  Eike

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