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* 25519: remove unused const, safeguard against unreduced scalars No behavior change, but it makes the existing code better match the forthcoming code for other curves. Rename nonAdjacentForm() to slide(), remove an unneeded and confusing constant, and do a reduction in slide() if 257 bits would be required. Note that in all the high-level functions, the top bit is always cleared, so the reduction is never necessary. But since the low-level functions are public, the check is a safe thing to have. * 25519: make identityElement public, deprecate neutralElement Also fix a few comments by the way.