[migration] add_workflow now ensure the entity type is actually workflowable, and a new make_workflowable migration function is available to make an entity type workflowable (closes #1382720)

#! /bin/sh -e

if [ -x "/etc/init.d/cubicweb-ctl" ]; then
    invoke-rc.d cubicweb-ctl restart || true
fi
 
 
#DEBHELPER#
 
exit 0