server backend for the Circle IRC client

 Circle is an IRC client which merges the best attributes of a local
 client and the common screen+irssi recipe:
 .
  * Keep IRC connects and state on a backend server, allowing
    disconnections from local UI.
  * Interact with a real local GUI for the frontend, instead of
    incurring SSH roundtrips for every keypress.
 .
 Circle uses Tangence for its underlying communications layer.
 .
 This package is meant to be used together with a package providing
 a user-facing frontend, e.g. circle-term or circle-gtk.