Ensemble Curves: "Import Ensemble" Command

[JacobStoren]

Command must be available as context-command in the plot project tree, on summary-plot related stuff.

• Use the recursive dialog with different title
• Display Dialog to enter a name for the ensemble, default Ensamble "n"
• Deduce a case ID based on the path. Typically the last characters not equal in the paths.
  • Alternatively
    • let user select what part of the path is Case ID,
    • and what is the Ensamble name
• Issue warning if:
  • The lists of parameters in the parameters.txt files does not match

Spec #2610