Clutter removed

The map pages have been modified after a request to lose all those German wind farm NOTAMs (more than 1200 of them!). All map pages now have an option to hide NOTAMs for obstacles. Similarly, if the maps contain kite flying or firework display NOTAMs, these can also be hidden.

4 Jul 2018: European-style distances written with decimal commas, eg '3,5NM', are now recognised correctly.