Documentation branch

It re-organizes the repository for a better user experience and automatic generation of documentation. While improving the documentation, we also add some auxiliary functions to improve the load of time-series data and reference data.

We have now automatic Web-Page generation for the repository thanks to Continuous integration. It opens doors to start implementation of unit tests.

@alibeam I added Carsten as review, but it would be awesome to get also get your review.

@carstenn this is a long merge request. All the activity related with this work is listed below.