Feature request: snexpire based on article numbers.

Hi,

snexpire(8) takes /^-[0-9]+[hdwm]$/ as the expiration age.  It would be
nice if I could also specify articles by a numeric range as I could then
scan all the users' .newsrc for a group, work out what article they've
all read up to, and expire earlier numbered articles.

Perhaps /^-([0-9]+[hdwm]|[0-9]+-[0-9]+)$/ could be allowed to specify
articles m-n inclusive.

If there's a TODO list perhaps it could be added.  I may even get time
`to do' it one day.

Cheers,


Ralph.