Improve first experience by displaying hints on the first page

```
On the installation page, I see a lot of complaining about getting webgrind to 
work.

It actually isnt that hard, but webgrind should be able to answer all setup 
problems on the first page. Ie. display some installation hints there, 
depending on the current settings for profile directory etc.
```

Original issue reported on code.google.com by `maar...@talkin.nl` on 28 Aug 2010 at 2:44
