Merge pull request #10 from open-ideas/Annex60

Annex60 pull into issue34_StructureError issue branch
A60 based air leakage
Error in conditional connect of MonoLayerOpaque.mo
removed replaceable parameter by replaceables
change default value of n50 to 0.4 and add min=0.01 because a n50=0 gives rise to a division by zero.
Merge branch 'issue34_StructureError' into Annex60
add README_climate.txt with name of the columns of the TMY climate file and if the values are filled for the give file of Uccle.
Merge branch 'issue53_AddReadmeToClimateFile' into Annex60
minor changes according to the comments on pull request.