panorama.md still had a frame that did not fit end the job, and FR-MRG-5
still said the merge stops; since 621a6b83 the frame is named on its
row and unticked, and the rest are solved again from the pairs already
matched. §15 records the split of align into match_pairs and solve and
why re-aligning a subset from scratch moved every RANSAC seed, and the
rule e98b1def gave a blown sample, which §8's "nothing about being a
RAW is lost" now mentions. The manual says where the boxes are and
what an unplaceable frame does to Merge.