Reorganizing single-column experiments

[adcroft]

This is a heads up that we are about to move some experiments around within MOM6-examples.
Any testing scripts you use will have to be adapted once we've committed the reorganization.

• single_column and single_column_z are being merged such that
  • ocean_only/single_column/ -> ocean_only/single_column/BML/
  • ocean_only/single_column_z/ -> ocean_only/single_column/KPP/
• SCM_KPP_tests is being renamed as are the sub-directories
  • ocean_only/SCM_KPP_tests/ -> ocean_only/CVmix_SCM_tests/
  • ocean_only/SCM_KPP_tests/WSwPSBF.A/ -> ocean_only/CVmix_SCM_tests/wind_only/KPP/
  • ocean_only/SCM_KPP_tests/WSwPSBF.B/ -> ocean_only/CVmix_SCM_tests/skin_warming_wind/KPP/
  • ocean_only/SCM_KPP_tests/WSwPSBF.C/ is being deleted
  • We will be adding a host of new tests under ocean_only/CVmix_SCM_tests/

After the reorganization we will, in later commits, be:

• adding a BML/ test under each of the CVmix_SCM_tests;
• extending CVmix_SCM_tests to include mech_only, skin_warming_mech, sw_warming_only, cooling_only, evap_only, precip_only, precip_wind, and probably more;
• adding a third boundary layer scheme (IEBL) under all the above locations.