[rset] New method: ResultSet.one() This method will return exactly one entity while enforcing its existence and unicity. The idea is shamelessly borowed from SQLAlchemy Query.one(). Closes #3352314 [jcr: use len(self) instead of len(self.rows)]

etc/init.d
etc/cubicweb.d
etc/bash_completion.d
usr/bin
usr/share/doc/cubicweb-ctl
var/log/cubicweb
var/lib/cubicweb/backup
var/lib/cubicweb/instances