hdf5_msb

Merge pull request #605 in HDFFV/hdf5 from ~VCHOI/my_hdf5_fork:hdf5_1_10 to hdf5_1_10

* commit '201af70c24ccdd84e8fba376dab9b2024bf21dc4':
  Fix for HDFFV-7853 H5Ocopy doesn't work with open identifiers Changes made so that raw data for dataset objects are copied from cached info when possible instead of flushing objects to file and read them back in again.