Added 5 year geometric trend forecasting to investment.
Included demand to be forecasted.
Finalised better regression based geometric trend forecasting, incl.
new EnergyProducer parameter p:numberOfYearsBacklookingForForecasting,
which is used to determine the years used for the regression.
Merge branch 'feature/betterForecasting' into develop
Added JUnit test to test the forecasting in conjunction with
TriangularTrend class.
Small change to TriangularTrendTest
Worked on resolving forecasting bug. Created JUnit test.
Removed bug from fuel price forecasting. Added new JUnit test for
repository testing.
Fixed bug in forecasting fuel prices.
added substance repository.
Merge branch 'hotfix/forecastingBug' into develop
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