Fixed up the Vikings so they are again playable. Restored the "King" features. Added a Motherland top button for Vikings. Adjusted the code so that you can sell restricted goods at local prices to the Trade Screens even though you can not buy them. Goods you can not but appear for example: 9/- in red.
Merge branch 'master' of https://github.com/Nightinggale/Medieval_Tech

Conflicts:
	Assets/CvGameCoreDLL.dll