Zoom level in toolbar

[mtbeek32]

With 8.8.0 a Z value is introduced, indicating the zoom level after the X and Y coordinate.

There are 2 issues with this new functionality:

• Using the Z value can result in misunderstandings. Assume a AHN grid is presented in a map view, the Z value can then easily be confused with the Z value in the grid, the height at the location.
• The current value is, without a unit, also difficult to interpret. What is the relation with the fixed zoom levels in an optional WMTS background level?

Suggestion:

1. Change the label Z to: ZoomLevel or ZL
2. Add a unit and if known the fixed zoomlevel of the WMTS background level.