Converting a benign error message into an info

Dependencies

• [2] SXEYMYF7 Fixing the bad changes in history (unfortunately, by rebooting).
• [3] JP3BYVXX Fixing file paths on Windows
• [4] VO5OQW4W Removing anyhow in libpijul
• [5] I24UEJQL Various post-fire fixes

Change contents

• replacement in libpijul/src/working_copy/filesystem.rs at line 299
  [2.215190]→[2.215190:215252](∅→∅)
  − error!("while deleting {:?}: {:?}", path, e);
  [2.215190]

  [2.215252]
  + info!("while deleting {:?}: {:?}", path, e);