Added option lazy_grid_load

src/Copy.cc

src/Diff.cc

src/Filedes.cc

src/Fldstat.cc

src/Getgridcell.cc

src/Info.cc

src/Longinfo.cc

src/Ninfo.cc

src/Showattribute.cc

src/Showinfo.cc

src/Sinfo.cc

src/Timstat.cc

src/Tinfo.cc

src/cdo_def_options.cc

src/cdo_options.cc

src/cdo_options.h

src/fileStream.cc