- implementing server side code to load specified unit triggered by click on the tree items on right side of the editor
- added abstract methods loadData and displayData to abstract class EditorElement
- implemented above methods for EditorUnit and EditorComment only
- no client side code made to displace the HTML of previously saved Unit with specified unit HTML content
- fixed a bug where when new unit is triggered after an unit was saved, all input areas were disabled
- fixed a bug where when new unit is triggered, the old values of unit title and description were not erased