[Freeciv-Dev] (PR#9006) player_in_territory() function

["James Canete" <use_less@xxxxxxxxxxx>]

<URL: http://rt.freeciv.org/Ticket/Display.html?id=9006 >

This patch implements a function called player_in_territory(), which
returns the number of visible units pplayer2 has in pplayer's territory.

Along with this I have included a separate example patch which makes AI
diplomacy use this function to calculate the amount of love lost per
turn during wartime.

Issues:
-Should this function be in player.c?
-There's probably a more efficient way to do this.
-Compiler warning because can_player_see_unit() doesn't use "const
struct player *".

TODO:
-Use this as a base to introduce right of passage treaties and forced
expulsion of another civ's units.

-James Canete

aidip_territory_tweak.diff
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player_in_territory.diff
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