History of gc 5 changes

In src/cli/workspace.rs, lines 1512–1547 on 543bbf64d127d15e7be2d6692d8f5c8e155f48cc555c4f53dbaf89f07957e749. 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 1512,1547:src/cli/workspace.rs.