nf2ff: allow Radius, Eps_r and Mue_r definition

Signed-off-by: Thorsten Liebig <Thorsten.Liebig@gmx.de>
some new useful functions

- function to calculate the cross product
- function to calculate the scalar product
- function to calculate the intersection of a line an a plane

Signed-off-by: Thorsten Liebig <Thorsten.Liebig@gmx.de>
operator: fix in handling curve primitives in cylindrical coordinates

Signed-off-by: Thorsten Liebig <Thorsten.Liebig@gmx.de>
Merge remote-tracking branch 'dac/master' + Matlab compat fix

Signed-off-by: Thorsten Liebig <Thorsten.Liebig@gmx.de>
matlab: updates to far-field plot functions

Signed-off-by: Thorsten Liebig <Thorsten.Liebig@gmx.de>
Merge remote-tracking branch 'github/master'