nnimap article fetching

[Rajesh Godbole <argv@Sun.COM>]

I like gnus because one can read news and mail in a similar fashion.
There however seems to be a difference in the way one nnimap and
nnml groups are handled.

When fetching a group, one is prompted 
"How many articles from <group> (default <num>)"

For an nnimap group, <num> != <total # unread articles>, 
it appears to be <total # of articles>.  gnus-large-newsgroup
also isn't effectively looked at as a result.

Is (should?) <num> be customizable?   Is this a gnus thing or
nnimap thing?

-rajesh