Zip archives with multiple levels of folders, have file names of the 
form  'george/sam/file.ext'.  When expanding on the Mac, where the 
delimiter is colon and not slash, the folder structure is not 
created.  This fixes that whenever the archive's delimiter is 
different from the default directory delimiter.

Change Set:		Zip-extract-folders-tk
Date:			24 March 2003
Author:			Ted Kaehler

(Tested in a standard 3.6alpha)
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