Group voltage levels

[flo-dup]

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

• What is the current behavior? The voltage levels are all together

• What is the expected behavior? Group the voltage levels based on

  • their voltage
  • their country
  • some custom parameter

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

  • see only the voltages of interest
  • force layout first on the backbone then on the more local "sub-networks"