AM: diis_fock_module_close() is executed by all workers
AM: whitespace, formatting, comments, noops
AM: try shortening the long line
AM: rm state variables, use inquiry functions

This also removes the warning about inconsistent state of the saved data when
user modifies essential options via scfcontrol file.
AM: comments only
AM: present status of optional args is passed down

This is standard F77, no need to branch.
AM: use [] for literal array, nothing for scalars
AM: fix the comment that contradicts facts
AM: do_xxx_store() do exactly that, do not duplicate
AM: dont warn about not writing PHXC_CONTROL
AM: rm trailing whitespace
AM: FPP_HAVE_NANINFCHK, FPP_HAVE_ISNAN have no effect
AM: dont set WITH_NANINFCHK option
AM: dont compile naninfchk.o
AM: dont set unused FPP_HAVE_ISNAN
AM: rm unused naninfchk.f90 by Absoft Corp
AM: rm trailing whitespace
AM: NINT() is meant here, returns an int
AM: rm unused import, conditionallz
AM: rename, see how good wiki rendering is