Additional units for sensor

[RaphaelGebhart]

Might not be necessary due to https://github.com/DLR-SR/ThermofluidStream/pull/215

I suggest to add:

• h in kJ/kg
• s in kJ/(kg.K)
• M in kg/kmal
• H_flow in kW
• H_flow in MW

because this will yield 'nicer' values for the sensor display, e.g. the specific enthalpy of vaporization of water is always given as 2257 kJ/kg and never as 2257000 J/kg

Actually i would prefer a version, where we differentiate between display of the sensor (in non SI units) and output of a sensor (always in SI units) but this would cause major changes.

[RaphaelGebhart]

Might not be necessary due to #215