Merge esmci_remote_for_split/master

* esmci_remote_for_split/master: (1756 commits)
  Update for cime5.8.4
  fix linker error
  reset default pio_version to 1
  Makefile cleanup for mpi-serial build
  fix more conflicts
  Squashed 'src/externals/pio2/' changes from 0f241db..6f0afaa
  fix for Theia
  remove comment
  mods for Theia slurm job scheduler
  if CIME_DRIVER=nuopc add pylint check for nuopc files
  Build groups need to be hashable for cesm
  require ids in namelist definition files to be lower case
  move so that var is defined
  Fix some occurances of FFLAGS_NOOPT that now need FFLAGS
  Another fix
  Typo fix
  Better fix for cmake macros
  Cmake macro no longer relies on environment
  change test to allow for nuopc
  Fix pylint error
  ...

# Conflicts:
#	ChangeLog