History: the function was pulled out of Bank when each field wasn't
wrapped in a RwLock, and that locking 'balances' meant to lock
everything in the bank. Now that the RwLocks are here to stay,
we can make it a method again.
History: Qualifying the method names with 'verified' was done to
distinguish them from methods that first did signature verification.
After we moved all signature verication to SigVerifyStage, we removed
those methods from Bank, leaving only the 'verified' ones.
This patch removes the word 'verified' from all method names, since
it is now implied by any code running after SigVerifyStage.
Greg Fitzgerald
Anatoly Yakovenko
Robert Kelly
Anatoly Yakovenko