History of scheduler 2 changes

In crates/hub/src/flow.rs, lines 879–893 on v0.3.1. 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 879,893:crates/hub/src/flow.rs.