Report does not separate demands of different sectors into sections

Currently, the automatic report gathers all demand below section header Electricity demands. Either this header has to be deleted, and a column to the demand table added defining the energy carrier, or a loop to create headers for each of the sectors has to be created.

ES graph is malformatted in pdf version

The ES graph exceeds the page width when printing the report to pdf.

Checklist to make sure that the bug report ist complete:

• OS: Ubuntu

• Branch: dev, updated on 2020-08-27

• If applicable: Share screenshots/images of your problem
  simulation_report.pdf

• If applicable: Share used input data (see input data in [Bug] Report can not be generated when analysing a two-sector system #533)