I'm not a modder, but I think what follows is correct (I read just about every post on this forum).
We're not sure what the personality Groups means. And there are actually 4 values not 3, but value 4 is rare (only two races have it, I forget which ones). We THINK they are for aggressive, passive, neutral, but we're not sure. At least the Last time anyone mentioned it on the forum here I never saw a clear concensus reached.
# of planets to consider for anger, means that the AI looks at the worlds it knows about that the enemy controls and that it can colonize. It gets an anger mod for each one it knows about. There's an identical file for allies too.
The only place those are all defined are here in the forum, and in the files themselves.
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