UI/API changes

NEW: Probe detail: Resolve geo location dispute
NEW: Dashboard: Add share button to some widget titlebars
NEW: Measurement Detail: Add link out to troubleshooting when any msm has no replies
NEW: Prefs: set preferred address family (v4/v6) for use in forms and charts when possible
CHANGED: Probe detail (anchor): more links to TraceMON and LatencyMON
CHANGED: redirect /my to dashboard
CHANGED: Probe detail: hide all info if probe never connected
CHANGED: Probe detail: Show reason if probe written off
CHANGED: Prefs: Email validation in prefs
FIX: Probe-detail: Don't show troubleshooting text about cables if software probe disconnected
FIX: Probe detail (network): utc/local pref was reversed
FIX: Probe detail (results) prevent zooming in closer than smallest interval
FIX: Dashboard: time ago labels in api keys card
FIX: Probe detail (results) point calc error when zooming single series

Docs changes