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Expected output for 'h5extend h5extend_multifile.h5'
#############################
  Superblock extension contains 'EOA' message
  1: EOA = 48  EOF = 48
  2: EOA = 3074457345618259146  EOF = 3074457345618259474
  3: EOA = 0  EOF = 0
  4: EOA = 0  EOF = 0
  5: EOA = 12297829382473034528  EOF = 12297829382473034528
  6: EOA = 15372286728091293322  EOF = 15372286728091293594
  EOA and EOF do not match! Suggest extending the file for backward compatibility.