Set namespace of fopen to std::

src/Afterburner.cc

src/CDIread.cc

src/CDIwrite.cc

src/CMOR.cc

src/CMOR_lite.cc

src/CMOR_table.cc

src/Command.cc

src/Ensval.cc

src/FC.cc

src/Gradsdes.cc

src/Importamsr.cc

src/Importbinary.cc

src/Importobs.cc

src/Intgridtraj.cc

src/Intlevel.cc

src/Lic.cc

src/Maggraph.cc

src/Magplot.cc

src/Output.cc

src/Outputgmt.cc