add failure message.

For some reason the python error messages
are not printed in a slurm job, though they
are in interactively. this at least
gets the gist of it in all cases

pypiper/manager.py

@@ -1552,6 +1552,7 @@ def fail_pipeline(self, e, dynamic_recover=False):
             self.timestamp("### Pipeline failed at: ")
             total_time = datetime.timedelta(seconds=self.time_elapsed(self.starttime))
             print("Total time: " + str(total_time))
+            print("Failure reason: " + str(e))
             self._set_status_flag(FAIL_FLAG)
 
         raise e