Bug#372712: apt: Shouldn't download pdiffs by default yet

[<mjr@phonecoop.coop>]

I have independently hit this bug.  My download speed slowed from its
usual 100+kB/s average to around 3kB/s - worse than when I used to
use dialup.  It also appeared to be repeatedly downloading the same
pdiffs, but I understand from bug 372504 that it's a cosmetic bug.
Finally, after all the pdiff downloading, it aborted with "internal
rred error".

The next update seemed to download the package files normally,
so I could not reproduce/test the problem.

Please disable pdiff downloading by default until it supports
an upper limit on the number of pdiffs and the display problems
are corrected.

Thank you,
-- 
MJR/slef