Update based on comment from paper review

[euronion]

Changes proposed in this Pull Request

I've updated a number of technologies and assumptions based on comments received during a recent paper review.
Some numbers were inconsistent (for different technology scales, thus economies of scale did apply less strongly than they should have).

I also did update 3 of the DEA databases to match the new versions.

See the updated release_notes.rst for details.

@lisazeyen or @fneum : Could you have a look?

Checklist

• Code changes are sufficiently documented; i.e. new functions contain docstrings and further explanations may be given in doc.
• Data source for new technologies is cleary stated.
• [n/a] Newly introduced dependencies are added to environment.yaml (if applicable).
• A note for the release notes doc/release_notes.rst of the upcoming release is included.
• I consent to the release of this PR's code under the GPLv3 license.

[fneum]

Great! Only one blunder on the methanation cost.

Unit changes from MW to kW are unproblematic for PyPSA-Eur-Sec as this is converted automatically there.

[euronion]

Last comment on Fischer-Tropsch / methanolisation:

There is a large range of cost figures reported for FTF (and Methanol and Methane synthesis). Much of it is owing to the scsize of the facility.

The new numbers of methanolisation and Fischer-Tropsch from Agora are on the higher end for large facilities and in the medium/right range for small facilities when compared to those reported by Brynolf et al (2017)

Compared with e.g. Faishi et al. (2017) where they report 60 (54) kEUR/bpd for 2030 (2040), which is equivalent to 847 (762) kEUR/kW the new numbers are a bit more optimistic (comparable).

Except for Mortenson et al (2019) no source states a value for VOM. The authors there state 1.5% of capital cost which seems to be where the DEA number is coming from.

FYI also @nworbmot