HowTo: Enable support for Fortran 2003 in CMake

a) Edit file /opt/local/share/cmake-x.y/Modules/CMakeFortranCompiler.cmake.in.

b) Add f03;F03 to variable CMAKE_Fortran_SOURCE_FILE_EXTENSIONS:

set(CMAKE_Fortran_SOURCE_FILE_EXTENSIONS f;F;f77;F77;f90;F90;for;For;FOR;f95;F95;f03;F03)