Merging in latest from upstream (HDFFV/hdf5:refs/heads/develop)
* commit 'd169391529f253a9903b8e6cacf38c59ceefab07':
Parallel Fortran tests now use the MPI module instead of including mpif.h.
First stab at gfortran versions. Tested on gfortran 7-9 so far.
Moved the -std=f2008 option to gfortran 9 for now.
Updated gfortran options. * Removed conclude_fc.am, which was causing verbose builds. Need to investigate more, though. * Added gfortran 9 warnings and flags. This will need to be separated into other version blocks based on when the options first appeared. * The standard is now explicitly set at 2008.
