Fewer clones really means fewer clones

Lowering the number of clones in Obeya's configuration now shrinks the pool to what the configuration names, and the folders of the clones Obeya created go from disk, so the space and their app stacks come back. A clone a task still works in stays until that task is done. A folder that holds work that has not landed stays, and the Workspaces pill says which one. Before saving, the dialog says which clones will go and warns when none would be left.