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Colon in directory name: Ubuntu 16.04

thermophysicalModels/radiation/radiationModels/viewFactor/viewFactor.C
thermophysicalModels/radiation/radiationModels/solarLoad/solarLoad.C
applications/utilities/preProcessing/viewFactorsGen/viewFactorsGen.C

They have reference to mesh object "coarse:<regionName>"

However tutorial heatTransfer/chtMultiRegionSimpleFoam/multiRegionHeaterRadiation seem to write this 'coarse' mesh data.

This ends in error under Ubuntu environment where : is not allowed in name

Replacing these instances with _ seem to work. Could you please review?

@mark @Mattijs @Sergio @andy