Alias `*` destinations, "via" aliases, and the max_queue_items and
give_up_send_after options have been out for more than a year, and a few
releases, with no significant concerns.
This patch removes the "experimental" notices from the documentation
accordingly.
Today, the maximum number of items in the queue, as well as how long we
keep attempting to send each item, is hard-coded and not changed by end
users.
While they are totally adequate for chasquid's main use cases, it can
still be useful for some users to change them.
So this patch adds two new configuration options for those settings.
They're marked experimental for now, so we can adjust them if needed
after they get more exposure.
Thanks to Lewis Ross-Jones <lewis_r_j@hotmail.com> for suggesting this
improvement, and help with testing it.
Alberto Bertogli