Fixed Doctrine_Record::exists() and removed final attribute since its *not* a method that is used by Doctrine internally

Added exists() to check for existence of data, getColumnCount() as alias to count() and renamed has() to hasRelation() for clarity

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DQL Limit now works with normal many-to-many relations as well as many-to-many relations using column aggregation inheritance

Added Doctrine::tableize(), Doctrine::classify() and DataDict::isValidClassname() for proper table naming. Fixed Table() to accept these (more need to be changed such as rawsql).Also fixed unbind method (missing argument)