Group Maintenance
=================
`b'
Find bogus groups and delete them
(`gnus-group-check-bogus-groups').
`F'
Find new groups and process them (`gnus-group-find-new-groups').
With 1 `C-u', use the `ask-server' method to query the server for
new groups. With 2 `C-u''s, use most complete method possible to
query the server for new groups, and subscribe the new groups as
zombies.
`C-c C-x'
Run all expirable articles in the current group through the expiry
process (if any) (`gnus-group-expire-articles').
`C-c M-C-x'
Run all articles in all groups through the expiry process
(`gnus-group-expire-all-groups').