Delete user keys when users row is deleted (schema change)
Use regular ints for indexedChars/totalChars in FT (schema change)
Don't queue memcached adds, since they wouldn't work cross-server

Also remove obsolete $time parameter to delete()
Use LIBXML_COMPACT | LIBXML_PARSEHUGE to parse XML
Retry sync processes on additional MySQL connection errors
If upload XML can't be parsed, try stripping control characters
Fix ';' instead of ':' in case statement, which apparently still works?