has_as_ancestor
  
  Description:
  public bool has_as_ancestor (
Object ancestor)
  
 
  
    Check if this has an ancestor ancestor somewhere up in the hierarchy.
     One can e.g. check if a Element is inside a 
      Pipeline.
    Parameters:
    
      
        | this | 
        
           a Object to check 
         | 
      
      
        | ancestor | 
        
           a Object to check as ancestor 
         | 
      
    
    Returns:
    
      
        | 
           true if ancestor is an ancestor of this. 
          MT safe. Grabs and releases this's locks. 
         |