Display feeder info on the 3WT leg inside a VL

[So-Fras]

Describe the current behavior

For a voltage level diagram, the feeder info values are displayed on both legs outside the voltage level and not on the leg inside the displayed voltage level.

Describe the expected behavior

For a voltage level diagram, the feeder info values are:

• Else displayed on the leg inside the displayed voltage level only
• Or displayed on the three legs of the three-winding transformer

Both behaviors would be available through an option.

Describe the motivation

It would fit the different needs of users (some want more information, some want less information / clearer diagrams)

Extra Information

See also these issue and PR :

• Three windings transformer SLD #565
• Fix 3WT feeder info on voltage level graphs #567