all-packages.nix: mark python3 'hiPrio' so that it takes precedence when version 2.x and 3.x are installed into the same environment
python3: update to version 3.3.0
gnulib: update to version 0.0-7899-g34f8464 and provide a proper meta section
texinfo-5.1: install tex-related files like 'texinfo.tex'
texLiveFull: include texinfo in the generated environment