Improve non sidebar navigation

This adds breadcrumbs, a list of submodules, permalinks, to top links and quick jump to section links.

It also adds the type of a function/macro/callback in small letters so that for a big function list like in Kernel where the "Functions" header is out of sight you can see whether you're looking at a function or a macro.

![breadcrumbs_and_submodules](https://f.cloud.github.com/assets/4168875/1157985/6bb33bfa-1fab-11e3-96f9-2aef6b338fe5.png)