Fixed OFFSET clause generation of Pgsql driver, which added the OFFSET keyword without a value to the SQL query in case of OFFSET 0. fixes #230

fixed declaration of Doctrine_Connection_Pgsql::modifyLimitQuery and Doctrine_Connection_Common::modifyLimitQuery to be the same

removing the closing PHP tags form all php files, it\'s not needed and can break sessions which are whitespace sensitive

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