Search function
Fix bug in find.

Move down from current node, not right node, if target < node.data
More debug info
Fix test setup.

Up/down pointers were missing.
Add test for finding rightmost node
Return found node
Add TODO
Remove dead code and comments
TODO expansion
Add test for failed search
Add simple insert function (unbalanced) with test
Remove obsolete (ll) code
Display nodes after test
Fix test setup (missing right ptr)