[#4045] Don't depend on running the codelist generator from same dir
[#4045] Don't depend on running the codelist generator from same dir

This commit fixes some usage of paths, so that the script can be run from
anywhere, and doesn't depend on being run from the same dir as the script.

akvo/akvo-rsr,akvo/akvo-rsr,akvo/akvo-rsr,akvo/akvo-rsr