Recoded points

Adds unique value classification for point symbolizers. It basically uses all the work that has been made until now for area and lines, so it has been quite straight forward for me. Some things to read, though, as there are about 2000 changes... 
- The UI comes with UOM and stroke management directly included. 
- I've cleaned up the unique symbol editors so that they may not contain some panels   when they are not needed. This way, I'm able to obtain light editors for single values in the unique value classification editor.