Ensure usage of Doctrine_Connection_Statement rather than PDOStatement in Doctrine_Connection::execute(). Fixes #365

fixes #364, optimized the bulkDelete for composite primary keys, security check for circular references in cascading saves

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  not included in the bundle; removed Record.tpl
- Changed manual newlines to PHP_EOL
- Added a parameter to explicitly set the table name
- Added a parameter to explicitly set the class file target

added test case to demonstrate PHP crashing when trying to save circular self-referencing relations (ticket #364)

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