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Added tests for Doctrine_Access. It uses annotations for exceptions and to mark functions as tests. Also changed some logic in access and implementing classes to make the abstraction a little bit more solid

reverting the reorganization done in 3455-3456 in order to make merging my experimental branch to trunk easier.

Preparation for new organization of code in to sub packages. Changed autoload() to work with new structure.

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

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Ticket: 150

added Doctrine_Access::__isset() and Doctrine_Access::__unset() for complete support of magic method invocations

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

Doctrine_Table::find now returns false if record is not found (instead of throwing InvalidKeyException) 

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