hdf5_plugins

Merge pull request #323 in TEST/hdf5_plugins from ~BYRN/hdf5_plugins_adb:master to master

* commit 'fbc45d709b59cf419e75a23918ef74b49cd8522c':
  Update testfiles
  HDFFV-11098 fix examples
  portability improvements
  OESS-16 - Change for loops for other compilers
  OESS-16 - Add initial SZ filter