[import / nearby] Fixes for Nearby modal window

yammer 3971 import / nearby

Fixes for Nearby modal window:

Step 2: Add the address after the name and make it a link to show the location on Google Maps.
Placing a marker on the map is optional; the center of the screen will be used to search for objects in that area.
The map in the modal window should maintain the same location and zoom level as where the user was on the main map.
Display validation error messages for users who are not authorized to import or who lack sufficient voting power.
Add a Nearby import button for guest users.

Waiviogit / waivio