With Andy's updates to the eigenvalue matrix API, we can now test getting both the full and the reduced eigenvalue matrix, as well as all the individual eigenvalues, whether they're zero or not.  Also added one more test, and updated the Python tester to be a bit more relaxed about values, and to be more robust about its matrix checking, since the reduced versions of things can't know how long they are beforehand.

The 'get eigenvalue matrix' tests currently fail, because of a change to the API that no longer returns a matrix.  It's still in flux; will fix when finalized.