hdf5_chunking_query_bmr

Merge pull request #1081 in HDFFV/hdf5 from ~BYRN/hdf5_adb:develop to develop

* commit 'bcd8b31f3c9ace931df4483b855fae371c27a3dc':
  Put back CTRL-L chars
  Update support link
  Update text
  Valgrind fixed by checking for prefix_len of 0