Patch for deleting tiles when commands are deleted from the undo stack

[Cyrille Berger]

On Sunday 21 March 2010, Cyrille Berger wrote:
> First, I thought it would be solved by my previous patch, because for some
> reason I thought there was transaction created, but it appears it is not
> the case. So now I am not too sure what is causing the problem.
I found the "reason", in kis_async_merger.h, if I comment:
245: 		parentOriginal->clear(rect);

then I don't have anymore memory increase. I am guessing something is not 
freeing memory like it should in the clear function... I will keep 
investigating.

-- 
Cyrille Berger