slow connection improvement using debdelta

[songbird <songbird@anthive.com>]

  For Richard and others at the end of a slower
connection or dialup.

  give debdelta a try.

  seems to be working well for me other
than some timeouts, but i just restart it
and eventually it finishes.

  compared to a regular update run it's
saving me quite a bit of time.

  just one example from my current update run:

Created,    time 167.18sec, speed 19kB/sec, locales-all_2.17-2_i386.deb         
 Patching done, time 10.73sec, speed 441k/sec (script 8.94sec 530k/sec) (unaccounted 1.79sec)


  songbird