code: def install_passband(fname, local=True):
      
      pbdir = _pbdir_local if local else _pbdir_global
      shutil.copy(fname, pbdir)
      init_passband(os.path.join(pbdir, fname))
docs: Install a passband from a local file.  This simply copies the file into the
      install path - but beware that clearing the installation will clear the
      passband as well
  
      If local=False, you must have permissions to access the installation directory