Planet population

[mobyvb]

Each planet should have a set population. When two planets of the same side are linked, the population should equalize between the planets (or go at a linear rate. We haven't completely decided yet). When two planets of opposite sides are linked, the population of each should gradually decrease until one's is completely depleted.

[irapha]

NOTE: multiple planets can transfer to the same planet, but one planet can only transfer to one other planet