Hut mercenaries not owned by nearby city

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When a hut generates mercenaries, they should be owned by a city nearby. (distance?)

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Ditto for units converted by diplomat

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1. Need to establish what rule to use when establishing "ownership". It has been suggested that being closer to an enemy city instead of your own means no ownership; I think there is a distance to one of your own cities which determines if the unit is "owned" by said city.
2. Use that rule in hut results
3. Use that rule in unit conversion

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The hut code is in BaseUnitLand.cs, TribalHut(). The first switch statement, case HutResult.FriendlyTribe. The unit is created but is not assigned a city.

The code further down in the routine (case 3:) suggests that the "owning" city would be the closest player city that is nearer than 4 distance.

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Diplomat unit bribe logic is in DiplomatBribe.cs, Bribe().

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To set a unit's "owning" city, invoke the unit's SetHome method with the city.