Remove license header from all source files

[eikek]

No description provided.

[Panaetius]

the year is not needed in each file.

No year/copyright in files: https://apache.org/legal/src-headers.html#headers
Copyright and year should be in NOTICE file: https://www.apache.org/legal/src-headers.html#notice

[eikek]

I think these guidelines are for software developed for the ASF. The license itself can be applied outsied the ASF. There is a little appendix for that: https://www.apache.org/licenses/LICENSE-2.0.html#apply -- and the example there includes the year 🤷🏼

I don't think a license header is necessary to apply the license (see https://www.apache.org/legal/apply-license.html#copy-per-file). It is enough to state noticeably that the project is distributed under this license. Tbh, I personally don't like the boileplate of repeating this license text in every file. I would be in favor to remove this entirely - or do we have this requirement at the sdsc?

[Panaetius]

just remove it entirely. we already did so in data services.