Credit and reset relative to current directory instead of the root

Dependencies

• [2] SXEYMYF7 Fixing the bad changes in history (unfortunately, by rebooting).
• [3] L4JXJHWX pijul/*: reorganize imports and remove extern crate
• [4] M3VTIZCP Validate change before reset

Change contents

• replacement in pijul/src/commands/reset.rs at line 50
  [2.99262]→[2.99262:99322](∅→∅)
  − let path = self.files[0].to_str().unwrap();
  [2.99262]

  [2.99322]
  + let mut root = crate::current_dir()?;

  + root.push(&self.files[0]);

  + let path = root.strip_prefix(&repo.path)?.to_str().unwrap();
• replacement in pijul/src/commands/credit.rs at line 44
  [2.180112]→[2.180112:180164](∅→∅)
  − let path = self.file.to_str().unwrap();
  [2.180112]

  [2.180164]
  + let mut root = crate::current_dir()?;

  + root.push(&self.file);

  + let path = root.strip_prefix(&repo.path)?.to_str().unwrap();
• edit in pijul/src/commands/credit.rs at line 98
  [2.181558]

  [2.181558]
  + .filter(|e| e.flag.contains(EdgeFlags::BLOCK) && !e.introduced_by.is_root())
• edit in pijul/src/commands/credit.rs at line 105
  [2.181725]

  [2.181725]
  + write!(self.w, "\n")?;
• replacement in pijul/src/commands/credit.rs at line 116
  [2.182042]→[2.182042:182077](∅→∅)
  − writeln!(self.w, "")?;
  [2.182042]

  [2.182077]
  + writeln!(self.w, "\n")?;