Lots of configuration migration script fixes. New dirs in /etc.
Fix dir cleanup (broke the debian/rules ‘clean’ target).

This fixes commit fc3af440da27e3aa185b7c30863165208a0189ac.
Update unvanquished-server news file.
Merge branch 'master' into debian
Merge branch 'master' into debian; update changelog
Merge branch 'debian'
Update Debian changelog.
Update .gitignore.