Merge pull request #520 in HDFFV/hdf5 from ~VCHOI/my_hdf5_fork:hdf5_1_10 to hdf5_1_10
* commit '6403b313d46ec6db46fcff2aaa4a9238f8265d85':
Incorporate additional code changes for the H5DOread_chunk patch from GE Heathcare (HDFFV-9934) This is the similar set of changes that was checked in to 1.8 branch: Incorporate the code changes that were missing from the original patch: (1) Additional tests in hl/test/test_dset_opt.c (2) Fix in src/H5Dchunk.c for direct access when an entry is in chunk cache but not dirty Tested on platypus, ostrich, kituo, mayll, osx1010test, moohan, quail, emu.
