Feature/mapl3 dev/dec23

[tclune]

Tested MAPL3 on OSX nag only. But should be small cleanup changes - nothing risky.

[mathomp4]

Intel seems to be throwing a build error:

/__w/MAPL/MAPL/geom_mgr/latlon/LatLonGeomFactory_smod.F90(279): error #6405: The same named entity from different modules and/or program units cannot be referenced.   [KEYWORDENFORCER]
      class(KeywordEnforcer), optional, intent(in) :: unusable
------------^
/__w/MAPL/MAPL/geom_mgr/latlon/LatLonGeomFactory_smod.F90(276): error #6404: This name does not have a type, and must have an explicit type.   [UNUSABLE]
   module function make_file_metadata(this, geom_spec, unusable, chunksizes, rc) result(file_metadata)
-------------------------------------------------------^

But oddly GNU was fine. That is...interesting.