(svn r15027) -Merge: tomatos and bananas left to be, here is NoAI for all to see.

NoAI is an API (a framework) to build your own AIs in. See:
   http://wiki.openttd.org/wiki/index.php/AI:Main_Page
 With many thanks to:
  - glx and Rubidium for their syncing, feedback and hard work
  - Yexo for his feedback, patches, and AIs which tested the system very deep
  - Morloth for his feedback and patches
  - TJIP for hosting a challenge which kept NoAI on track
  - All AI authors for testing our AI API, and all other people who helped in one way or another
-Remove: all old AIs and their cheats/hacks

src/saveload/afterload.cpp

@@ -48,6 +48,7 @@
 #include "../company_func.h"
 #include "../command_func.h"
 #include "../road_cmd.h"
+#include "../ai/ai.hpp"
 
 #include "table/strings.h"
 
@@ -468,6 +469,14 @@ bool AfterLoadGame()
 	/* Update all vehicles */
 	AfterLoadVehicles(true);
 
+	/* Make sure there is an AI attached to an AI company */
+	{
+		Company *c;
+		FOR_ALL_COMPANIES(c) {
+			if (c->is_ai && c->ai_instance == NULL) AI::StartNew(c->index);
+		}
+	}
+
 	/* Update all waypoints */
 	if (CheckSavegameVersion(12)) FixOldWaypoints();