[py3k] import range using six.moves Also, use create_entity instead of hand-crafting RQL queries. Fixes regression introduced in commit 768d332de17b.

usr/bin/cubicweb-ctl usr/bin/
usr/lib/python2*/*-packages/cubicweb/cwctl.py
../cubicweb-ctl.bash_completion etc/bash_completion.d/cubicweb-ctl