Merge pull request #421 from FerhatMihoubi/master

two commits
Correct displayed information if not total dataset is used.
Fix plots for Recursive Forecasting and save them to graphs subfolder.
Make sure that recursive forecasting happens in increasing order of observations (required for plotting)
Document recursive forecasts

Closes #303
Merge pull request #422 from JohannesPfeifer/RecursiveForecasts

Documentation, bugfixing, and cosmetic changes of recursive forecasts
Added documentation for the (stochastic) extended path simulation approach.
"slowc" option is now available to solve a simple equation in bytecode