[KPhotoAlbum] Bug 338702 and general settings dialog behavior

[Tobias Leupold]

> I thought I had offered a patch to avoid this problem a while ago;
> maybe I forgot to send it in.  In any case, your solution sounds more
> complete.

I just uploaded my proposed patch for the empty/duplicate/localized category 
name problem to the "category_settings" branch.

This stops the category settings dialog from creating duplicate categories, 
categories with no name and categories with the C locale name of an existing 
category.

Further, I reworked the layout and did an overall code cleanup.

What do you think?

Apart from that, there's one thing I don't grasp completely at the moment: 
what's it with that UntaggedGroupBox class? Why does this exist in an extra 
class? The behavior is a bit odd: if one wants to set something there, the 
category has to be selected (again) and the category names don't change as 
they are edited.

Can't we simply add this functionality to the actual category settings dialog 
and remove that class?

Tobias