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   Add test cases for msdosfs bug

   Add a test that writes a big file, reads it again, and compares the result.
   This detects the bug that briefly was in msdosfs.

   Also add tests that create lots of files in a directory. Do this in the root
   dir and a subdir because these work completely differently on msdosfs.  Need to
   enlarge the used disk images for this test.

   ok bluhm@

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