History of scheduler 2 changes

In crates/hub/src/flow.rs, lines 1920–1934 on v0.5.2. Every change that wrote or deleted one of these lines, or deleted a line from between them. Exact, because each line keeps its identity across edits; edits elsewhere in the file are not here. Also: oxy log -L 1920,1934:crates/hub/src/flow.rs.