Comes a time in life that one has to update from Drupl 6 to Drupal 7 when your code is hosted in http://getpantheon.com
i had to do it and i'm not very pleased with support department.
i opened a ticket and all i got was a link to http://dtek.net/blog/drupal-6-to-drupal-7-via-migrate-2
so i guessed there were no "pantheonical" way to do the upgrade and grabbed a tarball from Drupal.org
Meeeek! Error! Vanilla code from Drupal.org doesn't work in Pantheon :-(