Add flash2d to course repository

flash2d/compile/Makefiles/Makefile.common

flash2d/compile/Makefiles/Makefile_gfortran_plane

flash2d/compile/Makefiles/Makefile_gfortran_sphere

flash2d/compile/Makefiles/Makefile_intel_plane

flash2d/compile/Makefiles/Makefile_intel_sphere

flash2d/compile/irix/Makefile

flash2d/compile/irix/Makefile.sam

flash2d/compile/linux_g64/Makefile

flash2d/compile/linux_g64/Makefile.sphere

flash2d/compile/linux_g64/README

flash2d/compile/linux_ia64/Makefile

flash2d/compile/macosx_gfortran/Makefile

flash2d/compile/macosx_intel/Makefile

flash2d/compile/solaris_sparc/Makefile

flash2d/data/Domain.SWCosine.dat

flash2d/data/Domain.dat

flash2d/data/DomainSph.global.dat

flash2d/data/Domain_aviso.dat

flash2d/data/Domain_periodic_pi.dat

flash2d/data/Initial.dat