Layer is not selectable by lasso tool

[FarrantAlex]

- attempt to add coverage map and transmission marker to new (or existing) data package. 

- marker adds fine and can be hidden by hiding the data package, but the coverage map doesn’t. If you try again using the lasso tool around the coverage map, it adds something unspecified to the data package, but nothing that makes the coverage disappear (as you would expect it to with any other map data).

- this may be because the overlay is classed as an overlay or is binned directly in the soothsayer map elements tab (guessing here)
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