Implementation of outside temperature time dependency
The WindowOpening class now accepts piecewise constant function to define a time-dependent temperature. The concentration calculation in Models is changed accordingly (update of the transition times). Geneva hourly temperature (thanks @jdevine ) changes are given (as a dictionary) in models.py. Note that this is not a fully back-compatible change; appropriate changes were made in the expert app, but probably still to be done in the calculator.
This should close issue #15 (closed) .