Elastishot v0.1.7

Fixed

• Two lines of a card's left column changed and two were added while the
  right column stayed: the full-width row alignment paired the changed lines
  and the paragraph below them with the wrong rows and put the insertion two
  paragraphs too low, so the paragraph was reported as changed and the viewer
  showed the gap in the wrong place. The rows beside a gap that did not pair
  exactly now belong to the lane zone, and each column is aligned on its own
  from there: the changed lines are one region, the added lines another, and
  the rows below line up. A lane's rows are now hashed over the rows and
  columns the warp actually covers: the coverage mask is eroded at the
  edges, so a lane's last rows never matched and an insertion above them
  slid to the bottom of the lane.
• The viewer continued the row next to a gap under the gap's tint, which on
  a line of text drew a barcode. Each column of a gap now shows the colour
  it shows most often in the 48 rows on either side (page and card
  backgrounds stay, text goes). The engine writes those colours as
  gaps.png, one row per gap, and the pair page passes it as gaps-src, so
  a report opened from file://, where the browser refuses pixel reads,
  draws the same fill.