Reservoir with saturation

• Saturation:
  • optional parameters of reservoir for maximal/minimal value
  • simple example with minimal value 0 in first reservoir
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• Dynamic causality:
  • t < 8 → Flow component defines value of flow (as given by converter)
  • t > 8 → reservoir S₁ sets flow value to 0
  • changed again, if S₂ reaches an upper saturation limit