I added breadcrumb for book search result

It doesn't work here.
It does show something underneath the bodytext, but only the book I created first and not the whole structure.
To test the patch further I created two books. When I searched for a word which is in both books, underneath the first result only the bookname (with link) is showed from the book it is in. But the second result does show the same bookname, but that came from the other book!