Changes

remaining pages to move to Addon: prefix

* https://gramps-project.org/wiki/index.php/Life_Line_Chart_View

* https://gramps-project.org/wiki/index.php/HeadlineNewsGramplet ( check with Sam888 if this should be done ? )

** https://gramps-project.org/wiki/index.php/HeadlineNews ( should this stay as is because of older Gramps versions accessing it ?)