joesimms: added support for many roots for one table, added another example illustrating this, see EXAMPLE2.tree.php, also changed toString to __toString in getPath()
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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.
