fix wrong signature in weather
fixed wrong super call in demosimulation
use a unified function for weather forecasts. fix minor bug.
start demosimulation at every start
Dont initialize a StatisticalForecast for the DemoSimulation. Fixes #6
fix demosimulation measurement saving
rename forecasting.helpers to measurementstorage for clearity
deleted unused files
various fixes to make demo mode work again
various small fixes to get DemoMode running