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After long delay I finally found time to look at this.

I decided to go other way that doesn't need soo much
modifications. Instead of adding directories during copying
and messing all the code, it now just postproceses filelist
and generates directory list out of that. This leads to much
smaller patch and need to modify just one file. I'd like to
hear comments from you.

I currently tested just few packages and I'll give it more
testing in next days.

Patch is against 2.4c1.