Accepted new reference results due to a change in the version of Dymola.

This is for #18.
Merge pull request #20 from iea-annex60/issue18_homotopy

Code changes reviewed and found to be correct (no fundamental changes in #18 ).
Merge branch 'master' into issue19_cleanUpCode
Resolved conflicts:
	Annex60/Resources/ReferenceResults/Dymola/Annex60_Controls_Continuous_Examples_PIDHysteresisTimer.txt
	Annex60/Resources/ReferenceResults/Dymola/Annex60_Fluid_MixingVolumes_Examples_MixingVolumeMoistAir.txt