More refactorings. Commented out the plugin tests for now. They seem to wreak havoc with a lot of other tests (especially validator tests) and i havent found the reason yet.

some small refactorings. adding docblocks. creating guard clauses. refactor our some code into methods. no aditional test failures so it looks ok. also added some @todo comments

Refactoring. Started to introduced a clear separation between column names and field names (aka column aliases).\nDoctrine_Connection, DQL Parser classes/methods map field names => column names.\nDoctrine_Hydrate maps column names => field names during hydration.\nColumn names are only stored in Doctrine_Table:: and Doctrine_Table::.\nRelations use column names in 'local'/'foreign'.\nWhen using field names (column aliases) you need to use the column names in 'local'/'foreign' when setting up a relation (hasOne/hasMany), not the field names.\n\n In other words column names are only used to communicate with the database. field names are used everywhere else. the casing of field names does not matter. column names are forced to lower case for portability. If you dont use field names (column aliases) your column names are your field names (and therefore all lowercase).

added Doctrine_Connection::delete() method (needed as a convenience method as well as for the upcoming CTI support)

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deletes are no longer stacked in the end of transaction, now transactional integrity is always assured

'import' is a reserved word in PHP 6. Changed all method names / properties name from import to imprt. This means the documentation will need to be changed

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

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2. Merging Doctrine_Db functionality into Doctrine_Connection

3. Merging Doctrine_Db modules to Doctrine_Connection plugins