- rewrite: Libnew is now a separately distributed package
- update to Automake & Aclocal version 1.18.1
- update Automake generated files due to change [r3683]
- update Autoheader generated file due to change [r3683]
- update Autoconf generated file due to changes [r3683],[r3684]
- add 'AC_PROG_SED' macro
- add check for C++23 standard support
- update change summary logs
- update to Autoconf-Archive version 2024.10.16
- bump copyright to 2025
