set namespace of standard C function to std::

src/Adisit.cc

src/Afterburner.cc

src/Arith.cc

src/Arithc.cc

src/Arithdays.cc

src/Arithlat.cc

src/Bitrounding.cc

src/CDIread.cc

src/CDItest.cc

src/CMOR.cc

src/CMOR_lite.cc

src/CMOR_table.cc

src/Cat.cc

src/Change.cc

src/Cloudlayer.cc

src/Collgrid.cc

src/Command.cc

src/Comp.cc

src/Compc.cc

src/Complextorect.cc