MUC: Prevent visitors from broadcasting messages.

MUC: Improved handling of incoming groupchat messages (state preserved for possible later use).

Removed some legacy doc/ files.

Merge with Tobias's SASL redesign branch

Merge with trunk.

Reduce needed roundtrips during DIGEST-MD5 login.

Adding some human readable error messages.

Fail if username or password don't pass SASLprep.

Use new cofig option reading API.

Allow SASL PLAIN over unsecure connections when intended by admin.

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