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Fixed sqlite connection function binding issue when using Doctrine_Db as well as added proper primary key handling for export methods

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.

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