Re-work and correct new region creation (fails in grid mode)

* Scenemanager / FileBasedSimulationData
- Re-work and correct new region creation as the current mods crash
for grid mode operations.
- add a final yes/no to proceed with the creation of the new region
* EstateInitializer
- small change to prompt wording when creating a new estate
* Gridservice
- Correct 'show region <name> processing when used in grid mode