2. Merging Doctrine_Db functionality into Doctrine_Connection

3. Merging Doctrine_Db modules to Doctrine_Connection plugins

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remove getter / setter invocation from the core, getter / setter generation will soon be part of Import

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Doctrine_Record::unserialize() calls Doctrine_Record::cleanData(),
the data for gzip and enum types is correct. Fixes #322.

Also, minor formatting cleanup in Doctrine_Record::serialize().

Added back proper type-casting of integer and boolean types that was added in r419 and removed in r422. Fixes #321.

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