Started refactoring in DQL parser to separate Production into Parser and AST classes.
Finished first tests. Currently only 4 are active in IdentifierRecognitionTest, and only 2 are passing.

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.

- Fixed problem with Nested Set table definition not happening in time for exporting when NestedSet behavior is added through Doctrine_Template_NestedSet.

- Removed the reserved alias "base" from the nested set. It's no longer necessary to use that. Use whatever alias you want.

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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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