v0.2.0

Features:

• Multiple headers; multi-index tables (6225043)
• Spanning cells on both the top and left (bbbbd7c)
• Captions for tables (ca18bcc)
• "Margin" parameter allows text outside of table bbox to be included (ab81f22)
• Return visualized images as PIL image; allow padding or margin around visualized (ab81f22)

Several tweaks to formatting algorithm that may result in different outputs compared to prior versions.

• Automatically drop rows whose only non-null values is the "is_projecting_row" column
• Fill in gaps between table rows, to reduce skipped text
• Non-maxima suppression, as seen in inference.py (ab81f22)
  • "total overlap" metric has become less useful in favor of "rows removed by NMS"
• Widen out the rows to same length
• Several tweaks to conditions, parameters, heuristics
  • superscripts/subscripts now more likely to be merged to their parent rows

Many possibly breaking changes to config.

• TableDetectorConfig.confidence_score_threshold has been renamed to TableDetectorConfig.detector_base_threshold
• TableFormatter.deduplication_iob_threshold has been removed in favor of nms_iob_threshold
• spanning_cell_minimum_width, corner_clip_outlier_threshold, and aggregate_spanning_cells have been removed
• Tweaks to default settings may yield different results
• no_timm is now the default, which fixes #1.
  • this might cause slightly different bboxes