Support more contingency types in security analysis

[annetill]

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

• What is the current behavior?

• If the current behavior is a bug, please provide the steps to reproduce and if possible a minimal demo of the problem

• What is the expected behavior?

Increase the support of contingencies. We support Branch, Dangling Line, Line, Two Windings Transformer. We need to support Injection contingencies like Generator, Load, HVDC Line (treated as 2 loads for the moment) and maybe SVC. A bus bar section contingency will be a mixt of branches and buses contingencies. A shunt contingency must changed the equation system by removing the shunt equation.

• What is the motivation / use case for changing the behavior?

• 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)

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