This action moves the mouse cursor.  Unlike other actions which take
coordinates, this action's coordinates are always relative to the
user's view of the board.  Thus, a positive 
| mil mm | The cursor is moved by that amount, in board units. | 
| grid | The cursor is moved by that many grid points. | 
| view | The values are percentages of the viewport's view. Thus, a pan of 100 would scroll the viewport by exactly the width of the current view. | 
| design | The values are percentages of the board size. Thus, a move of 50,50 moves you halfway across the board. | 
| board | Same as design (for backward compatibility) |