UI/API changes

• NEW: Measurement form: clear probe selection action
• CHANGE: Coverage map rework
• CHANGE: Better meta titles for measurement detail tabs
• CHANGE: Remove banner/link to old probe detail pages
• FIX: Probe detail pages results: packet loss toggle not always working
• FIX: Probe detail pages results: Series filtering
• FIX: Measurement detail pages: latest timestamp display
• FIX: Measurement detail pages: make time travel default to latest tiemstamp possible
• FIX: Internet Maps Well-known: timestamp not showing in popups
• FIX: Internet Maps: recognize timestamp in url for time travel
• TWEAK: link color for newly created measurements in banner
• TWEAK: Probe detail network panel: Prefix->Prefix Length for IPv6 editing