- remove file pkg/pkg_default : set the default as a pkg group   ("default_pkg_list") defined in pkg/pkg_groups.
- remove file pkg/pkg_default : set the default as a pkg group
  ("default_pkg_list") defined in pkg/pkg_groups.

altMITgcm/MITgcm66h,altMITgcm/MITgcm66h,altMITgcm/MITgcm66h,altMITgcm/MITgcm66h,altMITgcm/MITgcm66h,altMITgcm/MITgcm66h,altMITgcm/MITgcm66h,altMITgcm/MITgcm66h