Issue690 multizone internal gains
Created by: nhuelsenbeck
This pull request solves #690 (closed) and works in combination with issue567.
Plots of the convective heat flow by persons (upper graph) and machines (lower graph).
Calculation for Office Archetype with code from development branches of TEASER and AixLib:
Calculation for Office Archetype with code from TEASER issue567-Branch and AixLib issue690-Branch: