Remove shared global vars npes, pe, root_pe

[underwoo]

The files mpp.c and mpp_domain.c shared three variables. This sharing is removed. Both files now have static global variables.

Cleaned up a few error messages in make_hgrid.c and remap_land.c

Added .vscode mac configuration.

fixes #182

[ngs333]

@underwoo , @ceblanton
CI Test07 has a failure. I'll investigate before merging.

re-reviewing.

[ngs333]

@underwoo
It looks like runoff_regrid was crashing because pe, npes, and root_pe
values in mpp_domain.c were wrong. This can be fixed for this program if
modify runoff_regrid.c to initialize them by
calling function mpp_domain_init() (after line 180):

mpp_init(NULL,NULL);
 mpp_domain_init();

But other programs have to be investigated in case they may have similar issues
even if we haven't seen their manifestation yet.

[ngs333]

@underwoo
It looks like there are other files that call mpp_init() but not mpp_domain_init(). I am not sure they all all use mpp_domain. The files are: transfer_to_mosaic.c, river_regrid.c, make_solo_mosaic.c, make_regional_mosaic.c, make_quick_mosaic.c, make_land_domain.c, make_remap_file.c, and check_mask.c.

[ngs333]

The work in this PR is being merge though PR #192