(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/engine.cpp

@@ -24,6 +24,7 @@
 #include "string_func.h"
 #include "settings_type.h"
 #include "oldpool_func.h"
+#include "ai/ai.hpp"
 #include "core/alloc_func.hpp"
 #include "vehicle_func.h"
 
@@ -376,14 +377,10 @@ void EnginesDailyLoop()
 					continue;
 				}
 
-				if (!IsHumanCompany(best_company)) {
-					/* XXX - TTDBUG: TTD has a bug here ???? */
-					AcceptEnginePreview(i, best_company);
-				} else {
-					e->flags |= ENGINE_OFFER_WINDOW_OPEN;
-					e->preview_wait = 20;
-					if (IsInteractiveCompany(best_company)) ShowEnginePreviewWindow(i);
-				}
+				e->flags |= ENGINE_OFFER_WINDOW_OPEN;
+				e->preview_wait = 20;
+				AI::NewEvent(best_company, new AIEventEnginePreview(i));
+				if (IsInteractiveCompany(best_company)) ShowEnginePreviewWindow(i);
 			}
 		}
 	}
@@ -460,6 +457,8 @@ static void NewVehicleAvailable(Engine *e)
 		FOR_ALL_COMPANIES(c) SetBit(c->avail_roadtypes, HasBit(e->info.misc_flags, EF_ROAD_TRAM) ? ROADTYPE_TRAM : ROADTYPE_ROAD);
 	}
 
+	AI::BroadcastNewEvent(new AIEventEngineAvailable(index));
+
 	SetDParam(0, GetEngineCategoryName(index));
 	SetDParam(1, index);
 	AddNewsItem(STR_NEW_VEHICLE_NOW_AVAILABLE_WITH_TYPE, NS_NEW_VEHICLES, index, 0);