What this MR does / why does DuMux need it:
Adds SPDX headers to all files and necessary license files to
dumux/LICENSES to make DuMux REUSE compliant.
Notes for the reviewer
Before you request a review from someone, make sure to revise the following points:
does the new code follow the style guide?
do the test pipelines pass? (see guide on how to run pipelines for a merge request)
is the code you changed and/or the new code you wrote covered in the test suite? (if not, extend the existing tests or write new ones)
does your change affect public interfaces or behavior, or, does it introduce a new feature? If so, document the change in
is the list of the header includes complete? ("include what you use")
all files have to end with a
\ncharacter. Make sure there is no
\ No newline at end of filecomment in "Changes" of this MR.
(if not applicable remove) if the examples are modified, is the documentation regenerated (using