Fixing the double-deletion of repairs for folder edges

Dependencies

• [2] VO5OQW4W Removing anyhow in libpijul
• [3] I52XSRUH Massive cleanup, and simplification
• [4] SXEYMYF7 Fixing the bad changes in history (unfortunately, by rebooting).

Change contents

• replacement in libpijul/src/missing_context.rs at line 118
  [3.699918]→[3.699918:699962](∅→∅)
  − repair_files_up(txn, channel, &files)?;
  [3.699918]

  [3.699962]
  + repair_files_up(txn, channel, &files, ws)?;
• edit in libpijul/src/missing_context.rs at line 126
  [3.700095]

  [2.26603]
  + ws: &mut Workspace,
• edit in libpijul/src/missing_context.rs at line 145
  [2.26694]

  [3.700569]
  + ws.repaired.insert(a);
• edit in libpijul/src/missing_context.rs at line 336
  [3.706977]

  [3.706977]
  + repaired: HashSet<Vertex<ChangeId>>,
• edit in libpijul/src/missing_context.rs at line 349
  [3.707673]

  [3.707673]
  + self.repaired.clear();
• edit in libpijul/src/missing_context.rs at line 358
  [3.707966]

  [3.707966]
  + assert!(self.repaired.is_empty());
• replacement in libpijul/src/missing_context.rs at line 382
  [3.58284]→[3.58284:58311](∅→∅)
  − v, dest_vertex
  [3.58284]

  [3.58311]
  + dest_vertex, v
• replacement in libpijul/src/missing_context.rs at line 486
  [3.712042]→[3.58892:58942](∅→∅)
  − if !is_alive(txn, channel, dest_vertex) {
  [3.712042]

  [3.712091]
  + if !is_alive(txn, channel, dest_vertex) && !ws.repaired.contains(&dest_vertex) {
• replacement in libpijul/src/missing_context.rs at line 580
  [3.715192]→[3.715192:715252](∅→∅)
  − debug!("p {:?}, dest_vertex {:?}", p, dest_vertex);
  [3.715192]

  [3.715438]
  + debug!("zombify p {:?}, dest_vertex {:?}", p, dest_vertex);