2. Merging Doctrine_Db functionality into Doctrine_Connection

3. Merging Doctrine_Db modules to Doctrine_Connection plugins

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fixing Strict standards: Declaration of Doctrine_Connection_Mysql::replace() should be compatible with that of Doctrine_Connection::replace()

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Removed getState() and concat() methods from mysql driver, getState() is not needed (it resides at transaction class) and concat is located at mysql expression driver

Ticket: 199

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

By default mysql connection doesn't use DQL record limit (it doesn't support limit in subqueries yet)

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