Modflow 6 clipping: Support putting a constant concentration at the transport model edge

[Manangka]

In GitLab by @JoerivanEngelen on May 15, 2023, 17:31

Support putting constant concentration at the model edge for transport models.

Concurrent with the imod.wq.model.SeawatModel.clip method, specify a constant concentration at the model edge. See:
https://modflow6.readthedocs.io/en/latest/_mf6io/gwt-cnc.html

[JoerivanEngelen]

Can be combined with #938

[JoerivanEngelen]

This is now possible, see for example #1744