The URL for DRUSH_TABLE_URL has changed because they switched to svn

It results with failed Aegir install due to non-existing now URL defined in Drush. Patch attached.

==> Installing drush in /var/aegir
--2010-08-05 20:19:01--  http://ftp.drupal.org/files/projects/drush-6.x-3.1.tar.gz
Resolving ftp.drupal.org... 140.211.166.134
Connecting to ftp.drupal.org|140.211.166.134|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 174203 (170K) [application/x-gzip]
Saving to: `drush-6.x-3.1.tar.gz'

     0K .......... .......... .......... .......... .......... 29% 73.2K 2s
    50K .......... .......... .......... .......... .......... 58%  290K 1s
   100K .......... .......... .......... .......... .......... 88%  292K 0s
   150K .......... ..........                                 100%  120K=1.2s

2010-08-05 20:19:02 (142 KB/s) - `drush-6.x-3.1.tar.gz' saved [174203/174203]

PHP Fatal error:  Class 'Console_Table' not found in /var/aegir/drush/includes/drush.inc on line 973
==> Drush is broken (php /var/aegir/drush/drush.php help failed)