Sql errors when using reserved words for a field name with the tree behavior.
Test Case restructured to allow thorough testing of the various permutations inwhich the tree behavior can be used
git-svn-id: https://svn.cakephp.org/repo/branches/1.2.x.x@7880 3807eeeb-6ff5-0310-8944-8be069107fe0
