* The testbuilds were fixed to make cmake install and automake install the same
* The cmake install did need patches for man3 installation on Unix
* The cmake install did need patches for dll installation on Windows
* The cmake install did need patches for dylib installation on MacOS
* The cmake install did need patches for pkgconfig generation
* Bump testbuilds to modern distro versions (ubuntu 20.04 centos 7.9 / 8.3)
* Takeover docker_mirror.py for air-gap testings (for testbuilds.py)
* handle UNZZIP-NOTFOUND in cmake and mark Ubuntu 'unzip' to be broken
* merge patches for zzip_pread feature from Max Kellermann
* merge patches for some bugs being found and reported via GitHub issues
* run azure-pipelines with -DZZIP_TESTCVE=OFF to skip CVE *.zip downloads
* use zziptests.py --downloadonly to get the CVE zip files for local storage
* The ninja builds for cmake were run regularly as it seems to be widely used.
* AND ... rename configure.ac to old.configure.ac to break outdated packaging scripts
* ....... see testbuilds/*-am-*.dockerfile that it still works to rename them back
!!! The old automake/autconf/libtool system will be dumped soon!!!