frontends: use new EXIT_BACKEND_NOT_FOUND exit code: - new EXIT_BACKEND_NOT_FOUND (5) is used when frontend can't find backend with the bridge. It differs from EXIT_BRIDGE_ERROR (3) which is used when something went wrong when connecting to backend. - use this exit code in quick app and in jp

You'll find install instructions in documentation (see doc/installation.rst).

If you need help, come the SàT official XMPP room: sat@chat.jabberfr.org or join us with a web browser via https://chat.jabberfr.org/converse.js/sat@chat.jabberfr.org