Implemented Doctrine_Pager_Range functionality. This classes enables a powerful way to generate page ranges (Fowler's pattern) to be used coupled with Doctrine_Pager. Already implemented 2 of the most used ranges: Doctrine_Pager_Range_Jumping and Doctrine_Pager_Range_Sliding.

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More refactorings. Commented out the plugin tests for now. They seem to wreak havoc with a lot of other tests (especially validator tests) and i havent found the reason yet.

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Added isValidModelClass() static method and fixed getLoadedModels() in order to resort back to the (classical) approach of class inclusion as a fallback when record classes have different names than their file names. The fallback behaviour of getLoadedModels() is now similar to what is was before the changes introduced in rev 3002.

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