Improvements of FluxTubes

[AHaumer]

Using FluxTubes to prepare examples of magnetic cricuits for teaching the basics of electrical engineering, I found some improvements:

• Improvement of documentation and reference arrows of ElectroMagneticConverter (should be electric current and magnetic voltage resp. mmf) - see Improve icon and documentation of ElectroMagneticConverter  #3220
• Include a hint that correlation between electric and magnetic values is according to a "right-hand screw" - see Improve icon and documentation of ElectroMagneticConverter  #3220
• One ore more simple basic examples that also show reference arrows - see Basic example of a magnetic circuit #3223
• Improved icons for shapes, visualizing the shape - see Improved icons of shapes #3219
• New shape CylinderSectionCircumferentialFlux, i.e. a section (w.r.t. angle) of a hollow cylinder, conducting flux in circumferential direction - see Add shapes HollowCylinderCircumferentialFlux and Toroid #3226
• New shape Toroid - see Add shapes HollowCylinderCircumferentialFlux and Toroid #3226
• Usage of SIunits.RelativePermeability mu_r instead of real mu_r
• See Further improvements of FluxTubes #3359 for remaining tasks.

[AHaumer]

@christiankral should'nt we apply the same improvements to QuasiStatic.FluxTubes?

[beutlich]

I can't find Thomas Boedrich's colleague Johannes Ziske among the github users ...

I invited @jziske both to MA organizational acoount and MAP-Lib team years ago but he never accepted the invitations. That's the reason why he does not show up in the list of assignees or reviewers.

[dietmarw]

@AHaumer Can you check if the last two open points are already fixed or can be fixed until tomorrow. Otherwise we should move them to a new ticket for the next version.

[AHaumer]

Let's shift the last points to the next version ...

[dietmarw]

@AHaumer Please make a new ticket with the remaining parts. That way we can include this ticket in the release notes for MSL 4.0.0. Thanks

[dietmarw]

Further improvements are dealt with by #3359. Thanks @AHaumer