PHP Code Generator 2.6

- <FIX> DNF not properly implemented for php4 and php5.1
- <FIX> GetChildrenList now always returns children in database.
(non-committed children are not returned). This addresses several bugs
which occurred when GetChildrenList was being called multiple times in
the same code block. Also addresses issues when GetChildrenList was
being called with different conditions successively.
- <FIX> GetSiblingList now always returns siblings in database.
(non-committed siblings are not returned). This addresses several bugs
which occurred when GetSiblingList was being called multiple times in
the same code block. Also addresses issues when GetSiblingList was
being called with different conditions successively.
- <FIX> PHP 4 GetSiblingList bug when fcv_array was being passed
- <NEW> POG Setup now contains unit tests for Sibling relations.
Improved previous unit tests as well.
- <NEW> Added PHPUnit3 tests to source code
- <FIX> Server-side POG update used throw errors when an @link