refurbishmend of nb after #135

[nailend]

As soon as this is done, plots in single-scenario jupy nb might need refurbishment, e.g.

• [x] percentage of autark hours.
• [x] the notes need to be adjusted according to new definition.
• [x] add equations.

[nesnoj]

I added a checkbox to #130 which is the superordinate issue on completion.

[nesnoj]

Unsure whether still required or not - not in the coffin yet...