update reuse license and docs

[lkstrp]

• Updates Installation docs
• Changes Copyright information from
  SPDX-FileCopyrightText: x - x The Atlite Authors
  to
  SPDX-FileCopyrightText: Contributors to Atlite <https://github.com/pypsa/atlite>
  • According to REUSE docs we don't need to add a year. Since the yearly update is quite often forgotten and therefore not up to date, I would remove it for better maintenence.
  • "Contributers to xx" is also the recommended as Copyright Symbol in the REUSE docs for such projects

[euronion]

This will make things easier in the future, thanks!

I've left some comments, including to substitute Atlite with atlite.

In case you were wondering why we have multiple licenses for different parts, we followed the advise here:
https://wiki.openmod-initiative.org/wiki/Choosing_a_license#Selecting_a_license

Licensing documentation/figures with a different license than the code allows them to be more easily reused elsewhere.

[fneum]

Nice, merge at will once @euronion's comments are addressed.