[freeciv-ai] settlerscleanup 4

["Per I. Mathisen" <Per.Inge.Mathisen@xxxxxxxxxxx>]

This patch no longer contains the amortize change. It will be posted in a
separate patch later. It also contains some changes taken from Ross'
corecleanups. It is not a pure cleanup, as it introduces some behaviour
changes since I removed the old city-from-hut-evaluation function and made
it use the AI's function instead.

Yours,
Per

"As Israeli forces pursued militants, civilians
continued getting in the way and dying as a
result." -- New York Times, April 21

settlerscleanup4.patch.gz
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