Support to pre-rewrite links to the correct protocol instead of redirect (patch)

Hi,

I decided to go for a cleaner approach to redirects and simply output the links to the correct URLs the first time (wherever possible - there may be corner cases where it doesn't work).

This greatly helps when using Boost, as it means that there's less reliance on bootstrapping Drupal to get users on the right protocol. We had a problem that when a user finishes checking out their cart, they get sent back to the site on HTTPS, but anonymous users at that point start getting Boost pages again, so remain on HTTPS even though they should've switched back.

To activate this support you need to have the url_alter module installed, which defines hook_url_alter_oubound(), a hook backported from D7. When this module isn't installed, this functionality won't work (until D7), but it won't break anything.

Thanks