Fixed #7179 -- Changed breadcrumbs on the add page so that a link to the...

Fixed #7179 -- Changed breadcrumbs on the add page so that a link to the change view is not included when the user doesn't have permission for that view.  Also added tests to ensure the link is not there when it shouldn't be, and there when it should be.  Thanks for the report & patch alen__ribic.


git-svn-id: http://code.djangoproject.com/svn/django/trunk@9276 bcc190cf-cafb-0310-a4f2-bffc1f526a37