Shorten demo scripts with copyobj

Conflicts:
	demo/bickley_jet/hyperbolic_shear_lcs.m
	demo/bickley_jet/hyperbolic_shear_lcs_details.m
	demo/double_gyre/hyperbolic_shear_lcs.m
	demo/double_gyre/hyperbolic_shear_lcs_details.m
	demo/ocean_dataset/hyperbolic_shear_lcs.m
	demo/ocean_dataset/hyperbolic_shear_lcs_details.m