HomeR redirects to front page instead of displaying it.

When displaying the front page from the root of the subsite, the links
in the page are relative to the root url (e.g.  http://localhost:3000/)
instead of the sub-directory of the page (e.g.
http://localhost:3000/wiki).
Generate links with no url relatively to current directory.

It was done this way in Gitit1.