in polar.cu the absolute error in energy is shown instead of the realtive error
in polar.cu the absolute error in energy is shown instead of the realtive
error

feltor-dev/feltor,feltor-dev/feltor,mwiesenberger/feltor,feltor-dev/feltor,feltor-dev/feltor,mwiesenberger/feltor,mwiesenberger/feltor,mwiesenberger/feltor