Added slider and improved behavior of video analysis

rowers/interactiveplots.py

@@ -1899,6 +1899,9 @@ def leaflet_chart_video(lat,lon,name=""):
         "Nautical": nautical,
     }},{{
         "Navionics":navionics,
+    }},
+    {{
+    position:'topleft'
     }}).addTo(mymap);
 
     var marker = L.marker([{latbegin}, {longbegin}]).addTo(mymap);