* Remove redundancy: no duplicate stepName
Up to now: provided explicity via command line argument and also contained in the
step metadata (which are as a file also provided as command line argument).
Now it is retrieved from the metadata file.
* Step name is not a required parameter anymore
Since the step name is derived from the config file
* Adjust method signature in test
* Export general configuration - part 2
First part in #956 missed to export the elements of the struct ...
* Add comment for exported struct
* Add function for opening config files