CHG: Merged the "hf mfu rdbl" and "hf mfu crdbl" commands into "hf mfu rdbl". One...

CHG:  Merged the "hf mfu rdbl" and "hf mfu crdbl" commands into "hf mfu rdbl". One read command.
CHG:  Merged the "hf mfu wrbl" and "hf mfu cwrbl" commands into "hf mfu wrbl". One write command.

Both new commands implement a help, authentication (0x1A/0x1B) for ULC and the rest,