setting # messages / screen - Horde 2, IMP 3

[liamr@umich.edu]

we've opened our imp installation up to a slightly wider audience while testing 
it.. and one of the pieces of feedback we got was that you can change at least 
some of the message display options (sort order, sort field) from the top level 
screen (mailbox.php) but you can't change the number of messages display per 
screen there.

it shouldn't be hard to impliment.. is anyone interested in this if i submit a 
patch?

liam