The number in the ally/enemy fields refer to government classes that the govt is allied/enemy with. These classes are assigned in the class fields. The Feds are in class 1 (most of the different govts labeled Fed. are, except for some 0s and a 2), so they're allies because of the 1 in the ally field. Likewise, the Auroran Empire (not the houses) is in class 2, so the Feds dislike them because of the 2 in Enemy1.
Oh, I guess you already knew that, reading your post again. The numbers aren't anything special, as long as they're linked up right. I could make the classes start at 30 if I wanted, and nothing would change. If you want to find who's in class 2.718281828.. (actually, they should be positive integers ), just look at everyone and find out.
Hope this helps.
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