adds an option to disable Fortran interface

configure.ac

examples/Makefile.am

examples/toy_dummy/dummy.sh.in

src/core/Makefile.am

src/mci/Makefile.am

src/utils/Makefile.am

tests/common/Makefile.am

tests/core/Makefile.am

tests/core/test_fortran_api.sh.in

tests/core/test_interpolation_parallel1.sh.in

tests/mci/Makefile.am

tests/mci/test_def_comps.sh.in

tests/mci/test_def_datetime.sh.in

tests/mci/test_def_grid.sh.in

tests/mci/test_def_mask.sh.in

tests/mci/test_def_points.sh.in

tests/mci/test_dummy_coupling.sh.in

tests/mci/test_dummy_coupling3.sh.in

tests/mci/test_dummy_coupling5.sh.in

tests/mci/test_dummy_coupling6.sh.in