PRD-2087: Legacy mode handlers updated for chart expressions; Widow/Orphan stabilization
 - Widow/Orphan handling disabled for 3.8 mode.
 - Added migration tool to help sanitize old reports.
 - Ensure that we only try to calculate widows/orphan sizes if there is a real need for it.
PRD-2087: Updated gold samples for invalid shifts around break-marker boxes. Also disabled all orphan widow processing for legacy (3.8) reports.
PRD-2087: Fixed an issue where keep-together causes errors with orphan selected boxes.