User story #1209
Share Sprints & Product Backlog with child projects
- Sprints (+PB) must have a shared check box.
- On a project all its Sprints (+PB) are assignable to an issue.
- On child projects also all parent projects (recursively to the top project) are also assignable.
- Product backlog & Sprint board must render all PBIs under the Sprint or PB even if they are of any child project (also tasks in Sprint board).