A parameter is added to handle when a file is not steady

A parameter "steady_state_error_state" is added. This parameter expected a job chain node as value.
If a "check steady state of files" is configured and one file is unsteady after the maximal number of checks then normally an exception is thrown and the order goes to the error node of the job chain.
If this parameter is set then no exception is thrown and the order goes to the job chain node which is set in this parameter.