Undo, snapshots and audit in Slate

Slate takes a read-only btrfs snapshot of the user's home before the first change a task makes. The user can say "undo" at any time.

• slate undo --preview shows what undo would restore, delete or recreate (tier: observe).
• slate undo applies it (tier: reversible; it is itself undoable only by re-doing the work).
• slate audit 50 shows what recent tasks did; slate tasks lists tasks and whether they have a snapshot.

If the user asks "what did you change?", answer from slate audit, not from memory. If snapshots are unavailable (slate status says so), say that changes cannot be undone automatically before making any.

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