AI: Diplomatic decisions

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This is a collector issue about how the AI diplomatic reactions should be
calculated for various negotiations and approach levels.

We have several negotiation options:

- improve relations (humble, neutral, aggresive) -> yes, maybe, no
- send money (neutral) -> yes, no
- trade agreement (neutral) -> yes, no
- surrender (neutral) -> yes, no
- declare war (neutral) -> yes, no
- ally against (neutral) -> yes, no
- ally against dargslan (neutral) -> yes, no

The problem is how to select a response.

Decision variables:

- stance to the player (0..100)
- current money
- money required to fix colony demands
- player's current observable military strength (e.g., fleets in radar, planets
under spy satellite)
- player's current observable production potential
- discounted military strength from actual battles with the player, if any
- AI's personality ?

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Original issue reported on code.google.com by `akarn...@gmail.com` on 6 Apr 2012 at 10:01