Forwarded request #1199079 from darix

- Update to version 0.17.1
- Fix #2004: Correctly handle volume names in backup command on
Windows
- Fix #4945: Include missing backup error text with --json
- Fix #4953: Correctly handle long paths on older Windows
versions
- Fix #4957: Fix delayed cancellation of certain commands
- Fix #4958: Don't ignore metadata-setting errors during restore
- Fix #4969: Correctly restore timestamp for files with resource
forks on macOS
- Fix #4975: Prevent backup --stdin-from-command from panicking
- Fix #4980: Skip extended attribute processing on unsupported
Windows volumes
- Fix #5004: Fix spurious "A Required Privilege Is Not Held by
the Client" error
- Fix #5005: Fix rare failures to retry locking a repository
- Fix #5018: Improve HTTP/2 support for REST backend
- Chg #4953: Also back up files with incomplete metadata
- Enh #4795: Display progress bar for restore --verify
- Enh #4934: Automatically clear removed snapshots from cache
- Enh #4944: Print JSON-formatted errors during restore --json
- Enh #4959: Return exit code 12 for "bad password" errors
- Enh #4970: Make timeout for stuck requests customizable