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.

Fleshing out functionality of CLI system and changed syntax of migration classes to only required a to parameter since we already know where we are coming from.

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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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