v0.5.0

Breaking changes

• Minimum Python is now 3.11 (was 3.10). TOML configuration relies on the standard-library
  tomllib, which only exists from 3.11 on; on 3.10 TOML configs never worked and only YAML was
  usable. Dropping 3.10 removes that split. Migration: run imapbackup under Python 3.11 or newer

Fixed

• ib-archive: stats, addresses and import now see zstd-compressed archives. Previously
  they only matched plain .eml files, so an archive written with --compress (files ending in
  .eml.zst) was reported as empty and could not be used as an import source
• ib-copy: a configuration in which a job omits role no longer crashes the role lookup
• ib-mailbox (exchange_journal + delete_after_export): a message that is not a journal item
  is no longer deleted from the server while being skipped. Without an error_folder such a
  message is now kept on the server instead of being removed unarchived

Changed

• CLI: ib-mailbox, ib-archive and ib-copy now exit with a non-zero status when a job or
  operation fails, so cron jobs and scripts can detect failures
• CLI: all three tools gained a --version flag
• ib-archive: the default log level is now INFO, consistent with ib-mailbox and
  ib-copy (was WARNING)