Bug#658346: APT does not work with a repository at Sourceforge

[Chris Greenshields <c.greenshields@opencfd.co.uk>]

Package: apt
Version: 0.8.16

When attempting to install a package which is held in a repository at
Sourceforge, it reports the error:

Err...
  Got a single header line over 360 chars
Failed to fetch...
  Got a single header line over 360 chars

This problem is due to a recent change at Sourceforge in which they
use a cookie to handle the system that directs the download to a
relevant mirror server.  A string is added to the URL which makes it
450 characters long, which exceeds 360, the maximum length hard-coded
into APT by the declaration:

#define MAXLEN 360

Simply increasing MAXLEN to 500, or 1000 to be safe, would fix this
problem.