new DFS and BFS algorithms + UI updates

- DFS graduates to algorithm status, new BFS algorithm
- Flood algorithm rewritten to work in all(?) cases
- notifIt replaced by jGrowl
- 9-square thing replaces duplicate binary tree
- UI for selection of algorithm improved (algo_armed)
- menus now slide up after 5s
- nodes have masks now: no more text-highlighting the labels
- CSS makes sense now
- disclaimer: algorithms work 90% of cases