plot_scalar_results.py needs to be restructured

[MaGering]

The script plot_scalar_results.py needs to be restructured since single scenarios are mixed with multiscenarios plots and the script is too extensive and cluttered.

Also a reason for issue #262.

Single scenarios as the examples run with

snakemake -j1 plot_all_examples

won't work executing

    subplot_invest_out_multi_carrier(CARRIERS_WO_CH4)
    subplot_storage_invest_multi_carrier(CARRIERS_WO_CH4)
    subplot_flow_out_multi_carrier(CARRIERS_WO_CH4)
    subplot_demands(CARRIERS)
    subplot_energy_usage_multi_carrier(CARRIERS)

Plotting capacities with

    plot_capacities()

are dropped (cf. this comment)

[jnnr]

The original issue does not persist after #301. Shall we close this or is there more to be done, @MaGering?

[MaGering]

No, this can be closed. Thanks for fixing it! Tested it running snakemake -j1 run_all_examples and snakemake -j1 results/2050-100-el_eff/plotted/scalars.