In edit mode, can now add to left and right to create siblings and to bottom. Adding to the bottom makes a new parent, and puts the new task and the task that was selected (by dropping the new task on it), and makes them chidlren of the new parent. In order to make it more user friendly, when you hover over the drop zones, a dark blue gradient appears in the relative zone. Also fixed up some code that dealt was not being updated upon drawing new trees.