Subscriptions to project issues for new projects added after subscription settings have been saved

this is a reposting of http://drupal.org/node/71606 -- there were some mis-postings there and the issue is a bit convoluted. let's start over... ;)

When a user has clicked one of the buttons at the top of the /project/issues/subscribe page (ie None, Own issues, All issues) to subscribe to all projects using that option, that same setting should also be true for projects added after that point. Currently when new projects are added, the user's subscription defaults to 'None' for those projects.