Distinguish old and new states in distribution and add assertions
Distinguish old and new states in distribution and add assertions

Assert that the sum over the distribution is always equal to the number of players/populations.

I figure out that they are no tests for multipopulation MFG in python

deepmind/open_spiel,deepmind/open_spiel,deepmind/open_spiel,deepmind/open_spiel,deepmind/open_spiel,deepmind/open_spiel