Seshat-Global-History-Databank/cliopatria: Updates to polities and wikidata in response to issues.

Version 0.2.1:

Fix issues from users, up to the limits of our current restriction to 'frame' years.

Serbia-Montenegro becomes Republic of Serbia in 2006. Dropped German Confederation shapes restored; now runs to 1866. Dropped North German Confederation shapes restored; runs to 1870. Duchy of Warsaw separated from Kingdom of Saxony between 1814-1870. Northern Song extended to 1127. Many corrections to clarify Africa's Gold Coast, Cape Coast, and Freetown Colony.

• Dutch Gold Coast though 1871, then British Gold Coast through 1960.
• Freetown Colony separated from Gold Coast and Cape Coast records. Mis-labeled French Equatorial Africa polygons added to French Algeria 1842-1847. Danish India and Danish Gold Coast records separated properly between 1659-1852. Fixed Portugal's overseas possessions missing MemberOf association with the Portuguese Empire after 1823.

Many corresponding wikidata and a few wikipedia updates.