bugfix: "crashes when quit with 'close window' button"

[Heinz Hornung]

Hello kdevelop-team,
I'm really fond of KDevelop and Gideon! 

I hunted the bug " crashes when quit with 'close window' button" and made a 
tiny patch:

The bugfix is in the file doctreeviewpart.cpp. It's trivial, just two lines of 
code have to be deleted (see doctreeviewpart.cpp.patch).
The buggy code accessed an already deleted object though 
TopLevel-getInstance()->...

I changed the class TopLevel so it will assert if someone tries a similar 
thing in the future. This may help finding a bug quicker (see 
toplevel.patch).

Kind Regards,
Heinz Hornung

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