BkmkMgrs 1.22.23 Release Candidate 12

In the Content Outline, after editing, moving or deleting items, the scroll position no longer sometimes jumps a fraction of a row, to the next row boundary.  Did this by (finally!) reverse-engineered how -[NSTableView visibleRect] works, and also remembering and restoring the extraPoints.

Still left in SSYDBL logs because I want to test cleanLines.pl.