promote Vcs-* fields to real debian/control fields, now that they are supported by dpkg
promote Vcs-* fields to real debian/control fields, now that they are supported by dpkg

ezyang/coq-packaging,ezyang/coq-packaging,ezyang/coq-packaging-precise,ezyang/coq-packaging-precise,ezyang/coq-packaging,ezyang/coq-packaging-precise