[IIDM 1.2] Introduction to non linear shunt

[miovd]

• Do you want to request a feature or report a bug?
  Feature

• What is the current behavior?
  Shunts can only be linear

• What is the expected behavior? What is the motivation / use case for changing the behavior?
  Shunts can be linear or non linear.

• Please tell us about your environment:

  • PowSyBl Version: ...
  • OS Version: ...

• Other information (e.g. detailed explanation, stacktraces, related issues, suggestions how to fix, links for us to have context, eg. stackoverflow, spectrum, etc)
  Linked to PR Introduction of non linear shunt compensators powsybl-core#1202

[mathbagu]

Reverted in v1.2, done in v1.3 (cf. #155)