Use dpkg-buildpackage -rfakeroot option to only run the parts of the
package generation process which require (fake)root privileges under
fakeroot. (e.g. debian/rules build should not be run as root.)
Simplify debian/rules by using dpkg-source v3 (quilt) instead of the
home-grown patch system in debian/rules.
Change debian/nightly_build.sh to build a non-native package.