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

[Cyrille Berger]

Hello,

Currently when KisTransaction is deleted, the corresponding tiles are not 
removed and are kept in memory. That patch takes care of deleting the tiles.

As far as I can see it works, and the test that were successful are still 
successful (and the others still failing).

-- 
Cyrille Berger
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