(svn r16909) -Fix [FS#2996]: NewGRF stations would be triggering assertions all over the place when using the more advanced station types.

-Change: make (rail) waypoints sub classes of 'base stations', make buoys waypoints and unify code between them where possible.

src/ai/api/ai_buoylist.cpp

@@ -3,12 +3,12 @@
 /** @file ai_buoylist.cpp Implementation of AIBuoyList and friends. */
 
 #include "ai_buoylist.hpp"
-#include "../../station_base.h"
+#include "../../waypoint.h"
 
 AIBuoyList::AIBuoyList()
 {
-	Station *st;
-	FOR_ALL_STATIONS(st) {
-		if (st->IsBuoy()) this->AddItem(st->xy);
+	Waypoint *wp;
+	FOR_ALL_WAYPOINTS(wp) {
+		if (wp->facilities & FACIL_DOCK) this->AddItem(wp->xy);
 	}
 }