Moved Doctrine_Migration_Builder and Doctrine_Import_Builder to Doctrine_Builder_Migration and Doctrine_Builder_Record. Updated code to work with new class names.

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.

Consolidated a few things. Initial entry of Inflector class. Moved some methods from Doctrine base class to Doctrine_Lib and Doctrine_Inflector.

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