hdf5_msb

Merge pull request #2589 in HDFFV/hdf5 from ~DEROBINS/hdf5_der:hdf5_1_10_warnings to hdf5_1_10

* commit '67983bc4313fecf3763f5b337b612357a3ee033b':
  Updated code in H5Xtest.c files and associated tests. Reverted overlong-strings warning that gives jam issues.
  Misc library test changes from develop.