Add sqrt() function to BigInt

[andreasschmid-hypoport]

Your class BigInt is so nice!

Would you mind to add a sqrt() function to BigInt? It should work as in the similar Java-BigInteger sqrt() method.

Regards, Andreas

[bwakell]

Thanks. Yes I think a sqrt() method should be, if not the most, one of the most important feature requests that I have on my hypothetical TODO list. I rarely have time nowadays, but who knows, one day... ^^

In case someone wants to have a go at it, some nice pseudo code can be found at: https://hal.inria.fr/inria-00072854/PDF/RR-3805.pdf