Set restore timeout inactiv, this should be really an advanced option,
probably only set for specific MUCs not as default for every MUC.
Set restore_lines to 10, so the User has an indication that Gajim can
display history, and that there is probably a setting to adjust.
Set muc_restore_lines to 100, this is a try to get a reasonable amount
of history, especially in small Groupchats. Most server will limit this
to 20-50 anyway. The limit 100 is more of a precaution if we run into a
misconfigured server. This is intended as a workaround until we can
implement MAM for Groupchats.