File pages should show the location of the file

Migrated issue

Reported by: jhodgdon

When you're viewing a function, you can tell what file it's in, and it shows you which directory the file is in too.

However, when you're on a file page, you don't see the directory path. It's kind of in the URL but not really readable by mere mortals. So it should be displayed on the page.

This is coming from #1109664: Text file display is not very good