mod_vcard: Cleaned up unused variables and global accesses.

mod_vcard: Removed stream feature.

mod_vcard: Refactoring and cleanup.

mod_vcard: Moved completely to new event based hooks.

mod_vcard: Fixed traceback on attempt to set vcards by non-c2s sessions.

MUC: Improved handling of error stanzas and made error messages concise.

MUC: Ignore invisible presence (incorrectly broadcasted or forwarded by ejabberd).

MUC: Fixed an incorrect error message.

MUC: Kick occupants on sending error messages to other occupants.

Merge with trunk.

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