nf2ff: fix: cleanup old calculations

Signed-off-by: Thorsten Liebig <Thorsten.Liebig@gmx.de>
current probes can be a point or line which allows for 1D/2D lumped ports

- this needs the new probe box interface in CSXCAD
- most tutorials have been updated

Signed-off-by: Thorsten Liebig <Thorsten.Liebig@gmx.de>
matlab doc updates

Signed-off-by: Thorsten Liebig <Thorsten.Liebig@gmx.de>