Simulation/IOMixin: Remove output storage methods from API
These two methods were added in the IO refactor of commit. There is however no need for this information to be public:
-
functionality of
output
should be covered byextract_results()
, albeit that CSVMixin does not implement this yet. -
output_variables
will be confused withself.get_output_variables()
Note that there has been no public release yet with these two methods. Removing them can therefore be considered to not be breaking the API.