Improve logutil memory usage.
Improve logutil memory usage.

- Filter tags = 'new' in SQL.
- Read one SQL row at a time, not all at once (fetchall()).
- Construct one Line object at a time, not all at once.
- Don't sort lines by timestamp in process_logfiles.
- Only sort lines that match the query in cli_list.

fmfi-svt/votr,fmfi-svt/votr