Change current hacked border to more general mechanism

```
Finish implementing rbrwBorder so it allows specification of different border
types and the renderer
takes note. Work out a way to have auto-style like Word (just subclass of
border and shader?).

This should yield the same appearance as on the current Financial Statements
example without the
hacking behind the scenes that does to decide what to render.
```

Original issue reported on code.google.com by `dentaroo@gmail.com` on 9 Apr 2009 at 8:29