Merge pull request #159 from lbl-srg/master

merge new radiosity connectors to openmodelica branch
Merge branch 'master' into openmodelica
Merge branch 'master' into openmodelica
Merge branch 'master' into openmodelica
Revised PerfectGases to allow simulation with OpenModelica.

This used Sensors.Examples.VolumeFlowRate for testing.
For testing, added code that does not work in OpenModelica.
Reverted debug changes of Media.
Applied patch from Adrian Pop.

This allows simulation of the example of the volume flow rate sensor with OpenModelica.
Merge branch 'openmodelica'