Do not compute powerplants from ppm if replace option is used

[yerbol-akhmetov]

Changes proposed in this Pull Request

Good day. The following changes aim to reduce unwanted computation if replace option is selected in the config while using custom powerplants data. It helps to avoid long computation of powerplants from powerplantmatching for some large countries.

Checklist

• I consent to the release of this PR's code under the AGPLv3 license and non-code contributions under CC0-1.0 and CC-BY-4.0.
• I tested my contribution locally and it seems to work fine.
• A note for the release notes doc/release_notes.rst is amended in the format of previous release notes, including reference to the requested PR.

[davide-f]

Great @yerbol-akhmetov :D Many thanks.
Contribution is pretty neat!
I'm adding few minor comments and merge it right away, unless you prefer otherwise :)
In particular:

1. the release note will be moved under new contributions [very minor thing]
2. I'll update the format of the custom_powerplants to the latest version. The reason being that when replace is selected, the new dataframe will have the format of custom_powerplants. Thus it is advisable to update.

As they are minor things, I'll quickly do and merge it :) Many thanks for the contribution!

[davide-f]

I'd merge as CI passes

[yerbol-akhmetov]

Great @yerbol-akhmetov :D Many thanks. Contribution is pretty neat! I'm adding few minor comments and merge it right away, unless you prefer otherwise :) In particular:

1. the release note will be moved under new contributions [very minor thing]
2. I'll update the format of the custom_powerplants to the latest version. The reason being that when replace is selected, the new dataframe will have the format of custom_powerplants. Thus it is advisable to update.

As they are minor things, I'll quickly do and merge it :) Many thanks for the contribution!

Thanks, @davide-f.