attach_next_to
Description:
Adds a actor to the grid.
The actor is placed next to sibling, on the side determined by side. When sibling is null,
      the actor is placed in row (for left or right placement) or column 0 (for top or bottom placement), at the end indicated by side.
    
Attaching widgets labeled [1], [2], [3] with sibling == null and side == 
      LEFT yields a layout of [3][2][1].
Parameters:
| this | |
| child | 
           the actor to add  | 
      
| sibling | 
           the child of this that   | 
      
| side | 
           the side of   | 
      
| width | 
           the number of columns that   | 
      
| height | 
           the number of rows that   |