Admin breadcrumb links assume app is rooted at /admin/

[oggie rob]

Hi,
The new admin branch is awesome! However while nothing broke from the previous branch it highlighted a problem with the breadcrumb links. So far I have seen two issues - there may be more:

1. If you change the name of your project to something other than admin - in your urls.py file - then at least the change password/logout links will fail. There are probably others.
2. The default link (in base.html) won't take you to the home admin page. I don't think this is intended as most screens will actually take you to the admin home location, but in some cases it will take you to the server root location. An example is the "confirm delete" page, where the link will be "​http://localhost:8000/" using the development server (this may not be a problem in other environments depending on how the web server segments django).

Anyway, throughout template code the href links look quite "fragile" - relative links so they assume certain locations, etc. I wonder if there is a solution (using, say, template tags) that will offer the project name, app name, module and/or action to help direct. I guess this still assumes certain locations but might be a little less likely to fail under some modifications.

[Adrian Holovaty]

Fixed in [1521]. Lemme know if I missed any links.