cubicweb-company #2800642 drop Division, only support company [validation pending]

at least in this very basic cube, which must be kept simple.

prioritynormal
typeenhancement
done in0.6.0
load0.200
load left0.000
closed by#e349877202bf drop Division, simply use Company subsidiary_of Company. Closes #2800642
patchdrop Division, simply use Company subsidiary_of Company. Closes #2800642 [applied]