Fix signingHash calls; make rsign output pre-sign hash.

Two things here:

- I needed to change the signing_hash() calls to signingHash(). Maybe the function was renamed?

- I changed the output of rsign.js to include the signingHash of the transaction that was actually used for the signature, that is, the binary version of the transaction *before* TxnSignature is added to the object. This makes much more sense than showing a value that is never really used anywhere in the transaction process.