Cleanup license

added 1 commit

• 43563929 - Add copyright sign and replace 2023 by 2024

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added 10 commits

• d9db67e1 - Remove trailing whitespace from the license headers
• 98d2a854 - Update m4 macros
• abef4a9e - Make configure.ac compatible with Autoconf 2.70+
• 960a0eb1 - Fetch licenses with 'reuse'
• 20a50d35 - Gitignore NEC diagnostic files.
• 47d105d9 - Add license headers to the Fortran .inc files
• 9a61485f - Add license headers to the Makefiles
• 5dfa61d4 - Update automatically generated Autoconf files
• f3113da6 - Remove obsolete file
• 9d64372b - Add license header for .gitignore files

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mentioned in commit 6a8f2ff0

merged