Remove the comment of an commented out line and make the line "active".

    If such an commented out line not exists it would be appended.

def uncomment_or_update_or_append_line(filename, prefix, new_line, comment='#',
                                       keep_backup=True):
    '''Remove the comment of an commented out line and make the line "active".

    If such an commented out line not exists it would be appended.
    '''
    return uua_local(filename, prefix, new_line, comment, keep_backup,
                     update_or_append_line=update_or_append_line)