Update for 1.13.*.
Add default border, and move to a decision to install WGR or DDR.
Add a option if like by example, if POL capitulate, SOV puppet him. By default, no.
If historical turn on, SOV will not respect the pact like reality. Because the pact they do, they need to return Poland territory Germany give them.

Little fix

Little rework for demand the unification of Germany.

The event about to respect the treaty is also trigger for the signatary of Yalta conference.
The Soviet Union when they accept the treaty keep their claimed states of Poland and Czechoslovakia.