Determinant fix

[caller]

…except me found and fixed this....

fixes this one:
NASAWorldWind#155

[wcmatthysen]

Jip. We should probably get that in. I suggest we get a unit-test added for this as well. A simple test that the original issue (NASAWorldWind#155) mentions is to test whether the determinant of a square Matrix is equal to the determinant of its transpose. We can probably add a test that looks something like this:

Matrix matrix = new Matrix( 1, 0, 0, 1,
                            1, 1, 0, 0,
                            0, 0, 1, 0,
                            0, 0, 0, 1);
double determinant = matrix.getDeterminant();
Matrix transpose = matrix.getTranspose();
assertEquals(determinant, transpose.getDeterminant(), tolerance);

[wcmatthysen]

We should probably check if this bug is not present in the other versions of WorldWind as well, most notably worldwindjs.