Package checksumgen: Information

- Make data processing independent of the current locale
  (Fixes: OVE-20251218-0001).
- Fixed sum_files.sh: Skip find in the case of an empty $INCLUDE.

- Untabify all help pages.
- checksumbot: Added --cb option to override CHKSUMBRANCH
  configuration option.
- checksumgen: Fixed shellcheck SC2317.

- checksumbot: Include checksumdiff report in the output.
- checksumbot: Include RPM names diff in the output.
- checksumbot: Added configuration option to include RPM package
  lists into the checksum repository.
- Added option to send checksumdiff statistic report to a file.
- Make checksumdiff report statistics in verbose mode.
- Make checksumdiff check the total record counters.
- checksumdiff: Verify per-task checksum files using one-line
  checksum views.
- Always replace per-task *.chksum files when checksumdiff.
- Make checksummerge support inplace file update.