mod_bosh: Fix for 'invalid key to next' error when 2 clients lose connection at the same time

net.server: Fix missing concatenation operator in error message

MUC: Prep given JID when changing affiliation.

Merge with 0.5

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.

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