Log Message:
Update to 1.7.0. From the changelog:

- Do a better job at drawing the merge lines by selecting the shortest
  path from the revision boxes. An analysis is now done whether the
  source and destinations should be on the left or right side.
- Fix the left_right case for merge lines to display correctly.
- Fix a +/-1 error on the merge lines to account for both rounding
  errors and the shadow of the revision boxes.
- Add configuration option 'merge_on_tag' to force the left_right case
  to display merge lines on the tags instead of on the top/bottom sides.
  This also solves imagemap overlaps where multiple sources or
  destinations would be displayed at the same position.
- Fix the imagemap function to record the correct position of the merges.
- Use automake
- Streamline the package with patches from the Fedora RPMS
- Imagemap bugfix