Add discriminant method to fmpz_poly, fmpq_poly, nmod_poly #312
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This PR adds a
discriminant
method to all polynomial classes which already have theresultant
method.It modifies fmpz_poly, fmpq_poly and nmod_poly (fmpz_mod_poly already has a discriminant method).
Note that for some reason the FLINT C library does not define a
fmpq_poly_discriminant
method.