Refactorings along with a speed improvement on the Hydrator when processing joined resultsets. Other minor tweaks.

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.

Added new exception classes, renamed Doctrine_Repository to Doctrine_Table_Repository, refactored many classes

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

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