Add normalized transaction hash
Pull out base32 coding tables so that they can be used by other functions.
Add z-base-32 encoding tables and inline helper methods, in addition to the already supported rfc-3548.
Implement error correction codes for base32 strings, using the CRC-5-USB polynomial. The encoder transforms 26-digit rfc-3548 strings into 31-digit z-base-32 strings, which are capable of recovering from any single-digit mutation, are visually distinctive, and protected against a wide variety of human-factor errors in the coding alphabet.
Switch to using error correction coded base32 for the normative transaction ID.