Conflict resolution

Dependencies

• [2] VO5OQW4W Removing anyhow in libpijul
• [3] HMMMKONL Fixing alive vertices
• [4] 7FFFKQZU add 'Default' implementations
• [5] SXEYMYF7 Fixing the bad changes in history (unfortunately, by rebooting).

Change contents

• resurrect zombie in "libpijul/src/missing_context.rs" at line 323
  [5.706721]→[4.602:621](∅→∅),[5.706721]→[4.602:621](∅→∅)
  + #[derive(Default)]
• resurrect zombie in "libpijul/src/apply.rs" at line 544
  [5.961172]→[4.674:693](∅→∅),[5.961172]→[4.674:693](∅→∅)
  + #[derive(Default)]