What's new:
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What changed:
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- Change magic number associated with process information block so that 32-bit
  Cygwin processes don't try to interpret 64-bit information and vice-versa.

- Redefine content of mtget tape info struct to allow fetching the number of
  partitions on a tape.


Bug fixes:
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- Fix creating two partitions on tape drives supporting initiator partitions.

- Update the internally used blocksize after setting a new blocksize for the
  current tape.