add new Richelot formulas from Sabrina Kunzweiler #24
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This branch is essentially Sabrina's patch taken from here, rebased onto the current version of the attack code.
The impact of this change is now smaller than for the original attack because of the "shortcut" strategy, but it still does matter a lot for guessing the initial digits. For example, breaking SIKEp503 seems about 20% faster with this patch.