Python linear algebra module -- requesting comments on interface

[Martin Miller]

Since one of the module's targeted applications is for 3D applications,
I think there should be some specific support for applying the
Matrix-vector product operation to a sequence of vectors instead of
only one at a time -- and it should be possible to optimize the
module's code for this common case.

I'd also like to see some special specific errors defined and raised
from the Matrix det(), inverse(), and transpose() methods when the
operation is attempted on an ill-formed matrices (e.g. for non-square,
non-invertible, singular cases). This would allow client code to handle
errors better.

Very nice work overall, IMHO.

Best,
-Martin