Changes

R_s for each ideal gas record now calculated with R_NASA

R_s for each ideal gas record now calculated with constant R_NASA_2002

Fix dimension error of PumpCharacteristics.linearPower (#4259)

Set unit instead of having it in description (#4264)

* Replace description with unit-setting.
Ideally it should use SI.Area etc, but I thought the idea was that the example should be more self-contained.
Closes #4076

* Also remove "in dB" since the unit is "dB".

* Update Modelica/StateGraph.mo

Co-authored-by: tobolar <tobolar@users.noreply.github.com>

* Update Modelica/StateGraph.mo

Co-authored-by: Thomas Beutlich <modelica@tbeu.de>

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Co-authored-by: tobolar <tobolar@users.noreply.github.com>
Co-authored-by: Thomas Beutlich <modelica@tbeu.de>

Make array inputs of external C functions const (introduced in Modelica 3.5) (#3700)

* Make array inputs of external C functions const

* Make array inputs of external C functions const

Utilize PressureSlope type