[Patch] Resizeable main window

[Robb, Sam]

> Also, this patch is a bit more useful than the last one - the Chooser 
> now sizes with the window.

Looks good (W2K, SP4).

Chooser resizes nicely. I can actually read package
descriptions... whoa.

The header on the chooser isn't resized along with the
chooser, though.

Other pages don't resize at all.  Not that there's
much reason for any of those pages to resize, but
if you enlarge the window (preparing for the chooser),
then the rest of the pages look odd.

-Samrobb