Add a prefix in `pijul archive` in all cases

Dependencies

• [2] IC45XBAF Adding / at the end of the prefix in `pijul archive`
• [3] UDHP4ZVB Fixing SSH asynchronicity issues
• [4] 76PCXGML Pushing to, and pulling from the local repository
• [*] SXEYMYF7 Fixing the bad changes in history (unfortunately, by rebooting).

Change contents

• edit in pijul/src/commands/archive.rs at line 63
  [6.192546]

  [3.8318]
  + if let Some(ref mut p) = self.prefix {

  + if !p.is_empty() && !p.ends_with("/") {

  + p.push('/');

  + }

  + }
• edit in pijul/src/commands/archive.rs at line 79
  [3.12795]→[2.0:192](∅→∅)
  − if let Some(ref mut p) = self.prefix {

  − if !p.is_empty() && !p.ends_with("/") {

  − p.push('/');

  − }

  − }