trac and blog should support openid and browserid

A number of users are willing to not be wholly anonymous. We shouldn't force everyone into our own paranoia world and if someone has an openid and/or browserid account, they can use it on trac and the blog (and forthcoming forums).

There is an openid auth plugin for trac at https://github.com/dairiki/authopenid-plugin

There is not yet a browserid auth plugin for trac, but I bet we can find someone to write one for us.

As for the blog, we'll need to upgrade to current drupal, or find new blog software, to get openid and browserid support.