UI/API changes

• NEW: Edit description and public status on measurement details
• CHANGE: Popup for traceroutes now centered and full size
• CHANGE: Add rDNS column to Traceroute tables in measurement results
• FIX: Number localisation in various places
• FIX: Total cost calculation in measurement details
• FIX: End date selection in measurement form
• FIX: Max map zoom for map data
• TWEAK: Make table scroll arrows more obvious
• TWEAK: Table formatting in coverage