Better re-logins

When you go to a Elftown-page and fails due to error in authorization (because you're logged out, the server has restared, or you're timed out) you will directly go to the page where you where last time.

This mean that if you're writing a posting and the server is upgraded, and you then try to post the posting, you only have to log in again and your posting will be posted.

Let me know it this doesn't work as well as it should.