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f82af9ffe2
I'm going to want to use this for finding special values in elliptic
curves' ground fields.
In order to solve cubics and quartics in F_p, you have to work in
F_{p^2}, for much the same reasons that you have to be willing to use
complex numbers if you want to solve general cubics over the reals
(even if all the eventual roots turn out to be real after all). So
I've also introduced another arithmetic class to work in that kind of
field, and a shim that glues that on to the cyclic-group root finder
from the previous commit.