Bug in matrix determinant function

[ManpreetXSingh]

Dear sir,
I have discovered a small bug in the matrix determinant function. It appears that the function does not account for 1x1 matrices, and instead causes a segmentation fault, despite the default matrix size being 1x1.

While it is unlikely that anyone would require the determinant of a 1x1 matrix for any practical reason, I believe it would be appropriate to fix this issue.

Determinant function at qbMatrix.h:780:0

Thank you

[QuantitativeBytes]

Thank you very much for pointing this out! I will push a fix for this as soon as possible. You're right that it is unlikely to come up, but as the default constructor constructs a 1x1 matrix, it could actually happen and so should be taken care of.