Added new soldier flags: SOLDIER_BACK_ATTACK, SOLDIER_SNEAK_ATTACK (work for punch and stab attacks only).

ClosestKnownOpponent() now can return ID of closest opponent.
CalcCoverValue: improved code to avoid friendly fire.
EVENT_SoldierBeginPunchAttack: use supplied gridno as sTargetGridNo may not be set yet

Boxing:
- added possibility of counterattack after failed attack
- added possibility of opportunity attack a passing enemy
- bonus in CTH for boxers for attack from the back

Boxing AI:
- for boxers, always use high morale so that they attack
- cautious boxer approach, reserve AP for two attacks (only if not attacking from the back)
- try to avoid frontal attack
- sometimes boxer may decide to restore breath instead of moving and attacking
- boxer can step back to move away from opponent, if he is low on breath
- improved main boxer AI

git-svn-id: https://ja2svn.mooo.com/source/ja2/trunk/GameSource/ja2_v1.13/Build@8876 3b4a5df2-a311-0410-b5c6-a8a6f20db521

TacticalAI/AIUtils.cpp

@@ -1385,7 +1385,7 @@ INT32 ClosestReachableDisturbance(SOLDIERTYPE *pSoldier, BOOLEAN * pfChangeLevel
 }
 
 
-INT32 ClosestKnownOpponent(SOLDIERTYPE *pSoldier, INT32 * psGridNo, INT8 * pbLevel)
+INT32 ClosestKnownOpponent(SOLDIERTYPE *pSoldier, INT32 * psGridNo, INT8 * pbLevel, UINT8 *pubOpponentID)
 {
 	INT32 *psLastLoc,sGridNo, sClosestOpponent = NOWHERE;
 	UINT32 uiLoop;
@@ -1397,6 +1397,11 @@ INT32 ClosestKnownOpponent(SOLDIERTYPE *pSoldier, INT32 * psGridNo, INT8 * pbLev
 
 	bClosestLevel = -1;
 
+	if (pubOpponentID)
+	{
+		*pubOpponentID = NOBODY;
+	}
+
 	// NOTE: THIS FUNCTION ALLOWS RETURN OF UNCONSCIOUS AND UNREACHABLE OPPONENTS
 	psLastLoc = &(gsLastKnownOppLoc[pSoldier->ubID][0]);
 
@@ -1500,6 +1505,10 @@ INT32 ClosestKnownOpponent(SOLDIERTYPE *pSoldier, INT32 * psGridNo, INT8 * pbLev
 	{
 		*pbLevel = bClosestLevel;
 	}
+	if (pubOpponentID && pClosestOpponent)
+	{
+		*pubOpponentID = pClosestOpponent->ubID;
+	}
 	return( sClosestOpponent );
 }