Pithos only updated when Theseus happened to check the extension
channel on a restart, and nothing showed which version was running.
A footer now shows pithos.sia and the version, as Aegis's does. In
Theseus it checks the channel when Pithos opens and every six hours;
a newer release shows as "↑ vX", one click downloads and verifies it,
and a second asks Theseus to restart and apply it. ↻ checks on demand.
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