Changes

:::::[[Gramps 5.1 Wiki Manual - Error and Warning Reference#_Error_and_Warning_Reference#Suppress_warning_about_missing_researcher_when_exporting_to_GEDCOM|Suppress warning about missing researcher when exporting to GEDCOM]]

:::::[[Gramps 5.1 Wiki Manual - Error and Warning Reference#Undo_history_warning|Undo history warning]]

:::[[Gramps 5.1 Wiki Manual - Error and Warning Reference#Errors|Errors]]