Adaptation Google maps into Leaflet maps

On the existing mapping server make the following adaptations for a transition from Google to Leaflet maps: - hook into the "Get Data" button - create a leaflet map and delete the google map from the source - use openstreetmap map tiles and perhaps one other type too (must be discussed) - put start and destination points on the map - show polyline which stands for the route - show/hide smaller markers on verteces after clicking the start/destination marker - popup box for each marker which contains position (lat, lng) date and time for the specific marker - show blue transparent circle when animal is under ground and latitude and longitude are zero - show red transparent circle if the marker is visible and "add alarm" is set to true (1) for this marker.