[Kst] [Bug 125873] Improvements to the "ordered" datawizard

[Brisset, Nicolas]

> We need a keyboard accelerator for copying the selected 
> fields from available to selected.  It used to be <alt-h> for 
> cHeck selected but anything is fine.
I have seen what George did for this request. Nice...
 
> There should be a small label telling us about this.
Sure, otherwise users not reading the list will not know. 

There is another change (so trivial I'm tempted to do it myself) which
I'd like to make: change the listbox back to Multi instead of extended.
Extended really isn't worth it here, and actually gets in the way as it
requires to use the keyboard when a simple click&drag would do it in 99%
of the cases.

Nicolas