commented 'from gamma_GP_from_SP_pt import *' in oceans/seawater/__init__.py
commented 'from gamma_GP_from_SP_pt import *' in oceans/seawater/__init__.py


Former-commit-id: 3bd49b0a81dc0f37bff91a5d576566128605a0f9
ocefpaf/python-oceans,pyoceans/python-oceans