Cherry-pick "Merge branch 'HDF5BuildUpdate-1.0-20180316' into '1.0'" into master

HDF5 Build Update, 1.0 branch (2018.03.16.)

See merge request !269 (merged)

(cherry picked from commit b26b94a5)

• 8ae0126b Updated HDF5 to build using autoconf/automake. Since CMake's
• 0fb1c2ac Updated FindHDF5.cmake to work correctly with LCG_93's HDF5 installation,