deleted code from 'divergence_and_curl' that appears in 'central_differences'. Added code to 'divergence_and_curl' that calls the 'central_differences' function.
deleted code from 'divergence_and_curl' that appears in 'central_differences'.
Added code to 'divergence_and_curl' that calls the 'central_differences' function.

fangohr/ovf2vtk,fangohr/ovf2vtk