[Kbarcode] Undo/Redo implented

[<dom...@t-...>]

Hi,

Undo/Redo is now avaible in KBarcode CVS HEAD. It works pretty good already 
and makes work with KBarcode IMHO much easier.
Checkout if you want ;).

CU Dom
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Dominik Seichter - dom...@we...
Krename - http://krename.sf.net
KBarcode - http://kbarcode.sf.net
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