v0.7.0

Breaking changes

• Safer default linking: the kernel now checks that files are identical before sharing their data. The old, faster behaviour is available with --fast / -f.
• Index files from 0.6.0 can't be read. They are rebuilt on the first run, which prints a "corrupted" warning once.
• --hardlinks now uses -H. -h is --help.
• The exit code is 1 when any link fails, or when no directory is given.

New

• -f, --fast and -V, --version.
• Much faster hashing: only files whose first 64 KiB match another file are fully hashed, hashing uses several threads, and hardlinked files are read only once.

Fixes

• No colour codes when output goes to a pipe or the systemd journal.
• -q is fully quiet, and dry runs say "would save".
• The systemd user units work as intended and run at low priority.