add assertion in Movers.FlowControlled_m_flow that guards against unreasonable operating points

[mwetter]

If Movers.FlowControlled_m_flow is working against closed or almost closed valves or dampers, then unreasonable high pressure drops and power use will occur. I run into such issues every few months when reviewing models.

This issue is to add in Movers.FlowControlled_m_flow code such as this:

protected 
   final parameter Modelica.Units.SI.Pressure dpMaxOpe = 2*max(eff.per.pressure.dp)
   "Maximum pressure allowed to operate the model";
equation 
  assert(senRelPre.p_rel < dpMaxOpe,
    "In " + getInstanceName() + ": Operating model with head dp_actual = " + String(senRelPre.p_rel) + " Pascals 
    which is two times above the pressure defined in the performance record per.pressure.dp = " + String(max(eff.per.pressure.dp)) + "
    This typically happens if the pump or fan forces a high mass flow rate through a closed or almost closed valve or damper,
    or if the performance record is entered unreasonable. Please verify your model.");

[Mathadon]

@mwetter if missing, the documentation may mention this problem and advocate the use of FlowControlled_dp.

[mwetter]

Implement feature, and add a parameter to either disable it or turn it into a warning.