Accumulated Rules, Scripts, Legend, and Site updates

Rules
Added: fuel stations, parking areas, monuments, bridges and tunnels.
Changed: "glow" icons, regional trails only on one side, text size,
contour emphasis.
Removed: shields on roundabouts, short primary roads at zoom 13
Scripts
Resume creation by default, download updated osm.pbf file otherwise,
minimize change-dir usage
Compute total trail length
New site design