Add red unmeasured icon to properties

in #16020 (moved) onionoo got support for the measured flag, we should display it on atlas to help relay operators like https://lists.torproject.org/pipermail/tor-relays/2017-May/012242.html with debugging.

The tooltip should include:

  • unmeasured is expected for new relays
  • not expected if your uptime is > x days (x=5?)
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