METSIS search map/WMS - move the additional layers to the layerswitcher.

[magnarem]

In the WMS viewer and the search map in the search interface, we have a button in the map called "Layers" that give the posibility to add other overlays layers to the map (by now only additional layers from vegvesnet have been set up, (riksvei,fylkesvei,europavei).
This button shows on the map, but on a site when user is not logged in, this button sometimes will end up in top left corner on the page, and can make conflict with the login-button.

A better solution is to move those layers into the layerswitcher (so all layers that can be enabled/disabled) will be in the same place.

[magnarem]

In progress