insert_next_to
Description:
Inserts a row or column at the specified position.
The new row or column is placed next to sibling, on the side determined by side. If side is 
      LEFT or 
      BOTTOM, a row is inserted. If side is 
      LEFT of 
      RIGHT, a column is inserted.
Parameters:
| this | |
| sibling | the child of this that the new row or column will be placed next to | 
| side | the side of  |