set_flags
Description:
Sets one or more buffer flags on a buffer.
Parameters:
| this | 
           a Buffer  | 
      
| flags | 
           the BufferFlags to set.  | 
      
Returns:
| 
           true if   | 
      
Sets one or more buffer flags on a buffer.
| this | 
           a Buffer  | 
      
| flags | 
           the BufferFlags to set.  | 
      
| 
           true if   |