hdf5

Merge pull request #324 in HDFFV/hdf5 from ~BYRN/hdf5_adb:develop to develop

* commit 'cceddc6b4f002fe98470f9f6af5dbf9f6461c95a':
  Correct result code for strings test
  Add extension to filename
  HDFFV-10128 fix string compare and add tests
  Lowercase math and set CMake commands