[doc] better documentation for "cubicweb-ctl newcube"
cubicweb-ctl newcube create cubicweb-<name> in current directory.
missing-dep-for-interpreter make => make | build-essential | dpkg-dev (usr/*/cubicweb/skeleton/debian/rules)embedded-javascript-library usr/share/cubicweb/cubes/shared/data/jquery.js