rnd-20060401-1-src

* added use of "Insert" and "Delete" keys to navigate element list in
  level editor to start of custom elements or start of group elements
* added virtual elements to access CE value and CE score of elements:
  - "CE value of triggering element"
  - "CE score of triggering element"
  - "CE value of current element"
  - "CE score of current element"