Change Orders: Delete & Rev Line Action, and a Shared Find-Old-Revs Grid

Sales order lines can now be rolled forward with Delete & Rev, in addition to the existing Cancel & Rev — and the choice you make is remembered on the line going forward, so a rolled line reports which action it was rolled with. Cancel & Rev used to leave a placeholder line behind at zero quantity, which is the wrong outcome when a line is meant to simply be replaced; now you can pick the option that fits. Quote lines default to Delete & Rev only, since quote lines were already being removed on apply — the old dropdown just mislabeled it as a "Cancel." The Find Old Revs window also picked up the same record grid used elsewhere for finding related documents, and a broken link on that grid that used to lead to the wrong page has been fixed along the way.