Pet: introduce affection

[rexim]

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Recently @Minoru complained about pet's aggressiveness.

Let's introduce a parameter for each participant of the conference that shows how much the pet likes the participant. The pet should choose its victim to attack on according to this parameter. More affection, less probability of an attack. The affection can be gained by feeding the pet. Healing decreases the affection since it's usually not a very pleasant operation (but you can still get PTCs from it). And of course, trying to kill the pet should significantly decrease the affection.

[ForNeVeR]

Oh, I like this idea!