Improvements to make for code quality

[johnwlambert]

• Clarify in the HTML report what determines a "valid" image pair

• Have 2 separate thresholds for R and U success? Put in place right before the results against the metric

• Could add image-only metrics before Verifier Summary

• Make a single table for each module (instead of FrontEnd Summary, have Verifier Summary, and PostProcessor Summary)

• There should be a #avg number of inliers w.r.t. est model for Veriifer, and also separately for the PostProcessor

• Create PostProcessor class in accordance with the graph
  

• Decide upon what goes in side-by-side plots when comparing with ground truth

  • Should COLMAP # tracks go into COLMAP column? or should it be error w.r.t. COLMAP?