tab management in kdev master

[Steffen Ohrendorf]

I had a look at it, commit 3ca6c8de3bcfd61d23f279e7364a3d0ff9a32c41 seems to 
be the problem, because if(!m_indexSplitters.contains(index)) has been 
replaced by if(!m_indexSplitters[index]), but the documentation of QMap states 
cleary that operator[] returns a default constructed object when there's no 
key found.
(only my 2 cents...)
-- Syron