Fix lib install path
There was an issue when creating Debian packages: the installation path for libraries was /usr/lib/ instead of /usr/lib/x86_64-linux-gnu/. This is set by default whenever the CMAKE_PREFIX_PATH is /usr/ in Debian, but the default is /usr/local/. So when creating the packages with the build_and_package.sh script, the CMAKE_PREFIX_PATH is set to /usr/.
The version of the cpp package is then increased to 1.1.1
A new tag should be created and also a new release.