IO-Compress 2.100

• bin/zipdetails version 2.02
  7556eba update to version 2.02
  237e9e5 more fixes for defalte bitmask
  b03cddf fix bitmask for deflate compression level

• trim whitespace
  6f5af76
  878f24f

• some POD updates for zstd
  1466d8a

• Fix warnings once in multiple locations
  #27
  fdf9958

• Avoid duplicate use statements
  #26
  11b34f5

• Avoid using indirect calls
  #19
  29a7c58
  d7a4f6e