Inconsistent licensing and extra files on zenodo

[schwehr]

This repo has a GPL license, but https://zenodo.org/record/6586972#.Ys2ze-zMI-R says:

License (for files):
[ Creative Commons Attribution 4.0 International](https://creativecommons.org/licenses/by/4.0/legalcode)

Additionally, the zip contains data from other projects, but it's not clear that those files are from external sources and what their licenses are. The readme.txt doesn't contain license info for the included files.

Also, if you do another zenodo release, I suggest doing some cleanup that will make the data easier for folks to use.

• Don't use & in file or directory names
• Remove the __MACOSX tree
• Remove .DS_Store files
• Remove gdal generated .aux.xml files

Maybe:

• Don't include outside (aka "third party") data, especially large files like ETOPO1 and the Seafloor age. They are cool, but make your zip drastically larger. I know that makes the QGIS project less interesting.

Maybe it would be best to have two zenodo entries where one is just the new work in global_tectonics.