Merge

mod_register: Added helpful text to registration error responses.

mod_register: Changed error type for hitting registration rate limit from 'cancel' to 'wait'.

mod_register: Fixed: No error was returned if username failed nodeprep.

util.encodings: Removed a bit of unreachable code.

util.encodings: Included idn-free.h, which explicitly declares the idn_free function.

util.encodings: Fixed: Last change was not ANSI C compatible.

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