Iterative algorithms in linalg.py sometimes go infinite

[convoliution]

Halting condition may not be functioning as intended.

[convoliution]

The issue occurs when the matrix being operated on has complex eigenpairs.

I have absolutely no idea how I would remedy this, but I also know that I plan on using these functions on covariance (symmetric) matrices so this issue won't come up.

But that's not satisfactory :P

[convoliution]

Power iteration and inverse iteration are supposedly valid for general-case matrices (not just Hermitian matrices) so I suspect the issue is with the halting condition (in calculating the norm, perhaps?)