MultiTable: Remove all empty sub-tables when elements are removed

Merge from waqas

util.multitable - A table with multiple key for each entry

Automated merge with http://waqas.ath.cx/

Changed util.datamanager to use util.serialization

Changed the datastore for vCards from vCard to vcard in mod_vcard and mod_register

Automated merge with http://waqas.ath.cx/

Changed the ejabberd import script to use util.serialization

Added module util.serialization

Abstract xmlhandlers a bit more, also add error callbacks

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