Deconstify PK_Ops. It's quite reasonable that some op will want to

precompute only as needed, or will want to access some other expensive
resource or etc.

Change how the secret for generating blinding is done in cases where a
PRNG isn't available. Use the operations public op to hide the secret,
for instance the seed for a DH blinding variable is 2^x mod p.

Make use of being able to mutate internal structures in the RW signer,
since that does have access to a PRNG, so use it to initialize the
blinder on first call to sign().

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