Make AnisotropicMatrix3DAnalytical immutable
	modified:   src/launcher/launcher.cpp
	modified:   src/libgcm/Engine.cpp
	modified:   src/libgcm/Engine.hpp
	modified:   src/libgcm/Interfaces.hpp
	modified:   src/libgcm/mesh/Mesh.cpp
	modified:   src/libgcm/mesh/Mesh.hpp
	modified:   src/libgcm/util/AABB.cpp
	modified:   src/libgcm/util/AABB.hpp