cubicweb #182778 commande cubicweb-ctl describe [open]

If someone clones the cubicweb forest, it might be helpful for him to have a describe command that would output a short description of what the cube is and provides:

$ cubicweb-ctl describe my_cube
current version: 0.13.2
description: here goes the cube description

entity types provided: MyEntityType1, MyEntityType2
relations provided: rel1

uses cubes: blog, comment, tag
prioritynormal
typeenhancement
done in<not specified>
load0.500
load left0.500
closed by<not specified>