Do not download changes if we already have them

Dependencies

• [2] BZSC7VMY address clippy lints
• [3] 5QTMRUXN Fixing a race condition between progress bars
• [4] SXEYMYF7 Fixing the bad changes in history (unfortunately, by rebooting).
• [5] BBKV6VMN Fixing push/pull messages, and do not reverse the changes to download/upload
• [6] I52XSRUH Massive cleanup, and simplification
• [7] M5FK3ABT Complete dependencies when pushing and pulling
• [8] UDHP4ZVB Fixing SSH asynchronicity issues
• [9] Q45QHPO4 Feedback on network stuff
• [10] 367UBQ6K Forwarding SSH stderr, and progress bar for push
• [11] 76PCXGML Pushing to, and pulling from the local repository
• [12] 5DVRL6MF Hard-unrecord
• [13] WKX5S4Z4 remove unneccesary explicit lifetimes
• [14] HXEIH4UQ Pulling more than 100 changes at once
• [15] K6GWUOD5 Styling progress bars

Change contents

• replacement in pijul/src/remote/ssh.rs at line 410
  [4.4027]→[2.177:255](∅→∅)
  − sender.send(hashes[*current]).await.unwrap();
  [4.4027]

  [4.4113]
  + if sender.send(hashes[*current]).await.is_err() {

  + break;

  + }
• replacement in pijul/src/remote/mod.rs at line 446
  [4.68892]→[4.68892:68924](∅→∅)
  − to_download: Vec<Hash>,
  [4.68892]

  [4.68924]
  + to_apply: &[Hash],
• replacement in pijul/src/remote/mod.rs at line 452
  [4.69111]→[4.69111:69159](∅→∅)
  − let to_download_ = to_download.clone();
  [4.69111]

  [4.0]
  + let mut to_download_ = Vec::new();

  + for h in to_apply {

  + libpijul::changestore::filesystem::push_filename(&mut change_path_, h);

  + if std::fs::metadata(&change_path_).is_err() {

  + to_download_.push(*h)

  + }

  + libpijul::changestore::filesystem::pop_filename(&mut change_path_);

  + }

  + let to_download = to_download_.clone();
• replacement in pijul/src/remote/mod.rs at line 485
  [4.794]→[4.69865:69903](∅→∅),[3.735]→[4.69865:69903](∅→∅),[4.69865]→[4.69865:69903](∅→∅)
  − for h in to_download.iter() {
  [3.735]

  [4.69903]
  + for h in to_apply {
• replacement in pijul/src/remote/mod.rs at line 512
  [4.1177]→[3.736:810](∅→∅)
  − .template("✓ Applying changes {pos:>5}/{len}"),
  [4.1177]

  [4.1262]
  + .template("✓ Applying changes {pos:>5}/{len}"),
• edit in pijul/src/remote/mod.rs at line 518
  [4.70716]

  [4.294]
  + debug!("waiting for spawned process");
• edit in pijul/src/remote/mod.rs at line 521
  [4.321]→[4.70716:70763](∅→∅),[3.847]→[4.70716:70763](∅→∅),[4.70716]→[4.70716:70763](∅→∅)
  − debug!("waiting for spawned process");
• replacement in pijul/src/remote/mod.rs at line 599
  [4.74014]→[4.74014:74109](∅→∅)
  − self.pull(repo, txn, channel, to_unrecord.clone(), false)

  − .await?;
  [4.74014]

  [4.74109]
  + self.pull(repo, txn, channel, &to_unrecord, false).await?;
• replacement in pijul/src/remote/mod.rs at line 619
  [4.74687]→[4.74687:74748](∅→∅)
  − self.pull(repo, txn, channel, to_pull, true).await?;
  [4.74687]

  [4.74748]
  + self.pull(repo, txn, channel, &to_pull, true).await?;
• replacement in pijul/src/remote/mod.rs at line 702
  [4.78533]→[4.78533:78599](∅→∅)
  − self.pull(repo, txn, local_channel, pullable, true).await
  [4.78459]

  [4.78599]
  + self.pull(repo, txn, local_channel, &pullable, true).await
• replacement in pijul/src/commands/pushpull.rs at line 358
  [4.119922]→[4.119922:120101](∅→∅)
  − .pull(

  − &mut repo,

  − &mut txn,

  − &mut channel,

  − to_download.clone(),

  − self.all,

  − )
  [4.119922]

  [4.120101]
  + .pull(&mut repo, &mut txn, &mut channel, &to_download, self.all)