[leafnode-list] List and feed

[Andrew Cranson]

> Please elaborate. Do you mean to download a list of available GROUPS
> (rather than servers) from one server?
>
> Fetchnews will query servers in the order listed in your configuration
> file, so put the fast ones on top and the slower ones to the bottom.
>
> Group lists will be downloaded from all servers and then merged to form
> leafnode's own newsgroup list.

Does leafnode automatically refresh the groups list every time it
connects, or can it be prevented from doing so after initial population?