Command: change_dir
  
Syntax: 
  s = change_dir( sequence )
  
Description:
  Same as cd command .
  Return -1 if the name of the directory not exist .
  
Example:

  atom s
  s = change_dir("C:\EUPHORIA\DOC")
  -- s would have -1 if there is no directory
       
See Also: 
  dir, current_dir
  
