Recursively erase sublayers of layer group

[Nicolas Brack]

Hello everyone,

This a very easy feature I often felt missing in krita : you cannot erase an area with multiple layer by selecting multiple layers or layer groups.
So here is a patch to do that for layer groups.  I don't quite understand the mechanism that selects a layer to erase, the patch only applies for layer groups.

Thank you,
Nicolas Brack.
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