hdf5

Merge pull request #2573 in HDFFV/hdf5 from ~DEROBINS/hdf5_der:develop_minor to develop

* commit 'ae07c9ba2429a9c49291bcd9f02c0ce36b0a60ce':
  Replaced a few calls to HDmemcpy with H5MM_memcpy, which does overlap checking.
  Removed HDgets macros since gets was deprecated in C99 and removed in C11 (gets() is not used in our repo).