Added conditional connector for JInConExtWin
Made heat ports conditional.

This is required because also the convection models are conditional. This commit also adds a test model for the AirHeatMassBalance.
Made connector conditional.

This is required to avoid a warning as glaUns.T is not used if there is no window.
Cleaned up code.
Revised room model.

Removed one layer of object hierarchy. The TestConditionalConstructions do not yet work in this commit.
Corrected use of parameter that was not declared.
Assigned temperatures of dummy connectors.

This is required for T to have a value if a construction is conditionally removed.
Updated documentation.
Deleted model BaseClasses/MixedAir

This model is no longer needed in the current version of the room model.