Add a filter that allows plugin authors to change the URL. Might be used to make relative URLs absolute again. Fixes #717
x-robots-tag noindex the robots.txt file, if it's not static. Fixes #719.
Fix weird looking inline documentation
If we're going to echo based on `$display`, we should always pass false to the `breadcrumb` function as otherwise we output a number 1 later on.
Add better OG handling for static homepages, fixes #727
Related to #700, author sitemaps should default to off.