[development] breadcrumbs

[Karoly Negyesi]

> By default, the breadcrumb should follow the menu structure, IMO.  

As you decree, so it will be done.

Just tell me what is "the menu structure". Is it the router structure? Ie. if I have node/123, then the next up is node. Is it the menu structure? The links you click to reach the page? This is doable. 

While I try to mirror D5 menu with D6, I wanted to differ here. If not now, we can do later. I am fine.