Example log messages:

Initialization

"Initializing the StructuredDiscretization package..."
"Succesfully initialized the StructuredDiscretization package"

Writing

"Writing model 'test_model' to /path/model/dir"... --> This will be for issue #492

"Writing the StructuredDiscretization package..."
"Succesfully wrote StructuredDiscretization package"

"Succesfully wrote model 'test_model' to /path/model/dir" --> This will be for issue #492

I think the nicest thing (potentially) for to do this kind of logging is to use decorators, to avoid code duplication.

As log levels: the "starting" logging message can be level "INFO", the ending one can be "DEBUG"

Should the "run" method of the Simulation class have logging? (I would add it with urgency level "CRITICAL" so that it'll always show up.)