Changed zone model by A60-based MixingVolume for air, but thermal non-A60-based infiltration of air
Added thermal mass in Zone for correct response time (+ whitespace)
Revert all whitespcae in  "Added thermal mass in Zone for correct response time (+ whitespace)"

This reverts commit fca16adcb52be19aa617201ffa79f40440d543d5.
Merge pull request #33 from rubenbaetens/issue27_A60air

Solves #27 based on A60 branch