Changes touching this path

• loot-revset: query-algebra crate for selecting sets of changes (#394) cdec28d1 · dbf3dbe6…
• the change graph gets one read view, and the two forwarding bands over it retire (#868) 826c3339 · dbf3dbe6…diff

Renames are not followed. loot's tree maps a path to an address, so a rename is a delete and an add. This list is the history of the name, not of the bytes.