[TASK] put spatial info box rendering in separate method
[TASK] Extend google.maps.LatLngBounds

* add method for transforming map coordinates to coordinates used by EOL data services
* #toEolCoords() returns {  nw_lat: {String}, nw_lng: {String}, se_lat: {String}, se_lng: {String} }
[TASK] Change infoBox handling

* simplify handling for spatial area choser
* add infoBox for initial area at startup