[dev] no more categories patch

[Chuck Hagenbuch]

Quoting ViliusŠumskas <vilius at lnk.lt>:

> Correct me if i'm wrong but we don't need categories in prefs.php.dist files
> anymore. If so, I made a patch.

I've done some trimming here, but I didn't remove the prefs entirely so 
that the
update/conversion scripts will still work. Comments welcome.

-chuck

-- 
"But she goes not abroad in search of monsters to destroy." - John 
Quincy Adams