allow supplying a value of q for special_supersingular_curve() #38483
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This is a follow-up to #36665: There, a CM endomorphism is chosen automatically to construct a "special" supersingular elliptic curve. In some applications, it can be useful to explicitly supply the desired degree of such an endomorphism to Bröker's algorithm, which is made possible by this patch.
Note that some of the subroutines used in the new code paths are relatively fragile, which can cause the functionality added here to fail for some inputs, but this has been documented in the appropriate places.