Fixing log --hash-only

Dependencies

• [2] SXEYMYF7 Fixing the bad changes in history (unfortunately, by rebooting).
• [3] 23LVKATN Use pager crate for log output
• [4] 2K7JLB4Z No pager on Windows
• [5] VIHXB7SG commands: set up pager for diff, change, and credit

Change contents

• replacement in pijul/src/commands/log.rs at line 47
  [2.135542]→[2.135542:135619](∅→∅)
  − for h in libpijul::change::full_dependencies(&txn, &channel).0 {
  [2.135542]

  [2.135619]
  + for (_, (h, _)) in txn.reverse_log(&channel.borrow(), None) {