preparation commit for henni

This commit includes:
* sql conversion script
* fixes for the column type for lat and lng fields
* removes prints / console logs
* unneccessary comments
* if no home data is available, we center to germany
* hide non working brand logos
* on closed stations the word "closed" is printed instead of outdated
price
* updates on filling stations is done in chunks of max 10
* configuration separates between development and testing

app/templates/account.html

@@ -82,9 +82,9 @@
             </div>
         </div>
     <script>
-        var lat = {{ map_pos[0] }};
-        var long = {{ map_pos[1] }};
-        var zoom = {{ map_pos[2] }};
+        var lat = {{ map_pos[0] or 0 }};
+        var long = {{ map_pos[1] or 0 }};
+        var zoom = {{ map_pos[2] or 0 }};
         var init_filling_station = JSON.parse({{ fs|tojson }});
         activate_map('mapdiv', ['get_button', 'set_home_button', 'go_home_button'], lat, long, zoom, init_filling_station);
     </script>