remove fvgridgeometry deprecation warnings
requested to merge feature/remove-fvgridgeometry-deprecationwarnings into feature/generalize-fvgridgeometry
This is the follow up of !1647 (merged) that removes all deprecation warnings
This should be merged into !1647 (merged) or directly after. We split this up to make the review process easier.
Edited by Bernd Flemisch