AI:

- new option AI_SAFE_SUPPRESSION adds additional checks for AI to avoid hitting friends when using suppression fire.
- chance to use suppression fire depends on actual chance to hit and SUPPRESSION_EFFECTIVENESS option
- reduced short burst to 2 bullets.
- improved code to use short burst

git-svn-id: https://ja2svn.mooo.com/source/ja2/trunk/GameSource/ja2_v1.13/Build@8901 3b4a5df2-a311-0410-b5c6-a8a6f20db521

GameSettings.h

@@ -1566,6 +1566,7 @@ typedef struct
 	BOOLEAN fAIPathTweaks;
 	BOOLEAN fAIDecisionInfo;
 	BOOLEAN fAIShootUnseen;
+	BOOLEAN fAISafeSuppression;
 
 } GAME_EXTERNAL_OPTIONS;