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- use fetchColumn() in fetchOne()
- removed PORTABILITY_FIX_CASE handling in fetchColumn() since this can be handled by PDO internally

updated NestedSet to use Zend coding standards.  still a few problems with return values using () that need to be looked at.

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- turned raiseError() calls into throw Exception
- MDB2 style query*() conversion to Doctrine style fetch*()
- removed PEAR::isError() calls

- turned raiseError() calls into throw Exception

- turned raiseError() calls into throw Exception
- MDB2 style query*() conversion to Doctrine style fetch*()

- turned raiseError() calls into throw Exception

joesimms: initial draft for tree support. NestedSet support included, placeholders for other popular implementations also included. Read the README.tree file for more information and changelog to core files. Modified core files have also been included in this commit. hope it works and you like it !

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