More atomic "file moves+transaction"

Dependencies

• [2] PP3E3TRE Do not move source if destination is wrong
• [3] L4JXJHWX pijul/*: reorganize imports and remove extern crate
• [4] SXEYMYF7 Fixing the bad changes in history (unfortunately, by rebooting).
• [5] Y7YAFMFF Fix path prefix striping on Windows.

Change contents

• replacement in pijul/src/commands/file_operations.rs at line 2
  [3.169184]→[3.169184:169208](∅→∅)
  − use std::path::PathBuf;
  [3.169184]

  [3.2404]
  + use std::path::{Path, PathBuf};
• replacement in pijul/src/commands/file_operations.rs at line 49
  [3.170280]→[2.0:58](∅→∅)
  − let target = std::fs::canonicalize(&target)?;
  [3.170280]

  [2.58]
  + let r = Rename {

  + source: &source,

  + target: &target,

  + };

  + std::fs::rename(r.source, r.target)?;

  + let target = std::fs::canonicalize(r.target)?;
• replacement in pijul/src/commands/file_operations.rs at line 61
  [2.361]→[2.361:409](∅→∅)
  − std::fs::rename(&source, &target)?;
  [2.361]

  [3.170538]
  + std::mem::forget(r);
• edit in pijul/src/commands/file_operations.rs at line 66
  [3.170592]

  [3.170592]
  + }

  +

  + struct Rename<'a> {

  + source: &'a Path,

  + target: &'a Path,
• edit in pijul/src/commands/file_operations.rs at line 73
  [3.170595]

  [3.170595]
  + impl<'a> Drop for Rename<'a> {

  + fn drop(&mut self) {

  + std::fs::rename(self.target, self.source).unwrap_or(())

  + }

  + }

  +