vchoi_fork

First stage of moving H5DOread/write_chunk() to src/ and making
them H5D calls.
* Moved H5DOread/write_chunk() to H5Dio.c and renamed to H5D*.
* Moved the hl/test/test_dset_opt test to test/ and renamed to
  direct_chunk.
* Moved the hl/test/dectris_hl_perf test to tools/test/perform
  and renamed to direct_write_perf.
* Updated autotools and CMake files.