Reduce memory usage with about 15 megs

src/unit/unittype.cpp

@@ -1365,6 +1365,11 @@ global void LoadUnitTypeSprite(UnitType* unittype)
 			fprintf(stdout, "Unit-type %s not found\n", type->SameSprite);
 			ExitFatal(-1);
 		}
+		if (!type->Sprite) {
+			LoadUnitTypeSprite(type);
+		}
+		unittype->Sprite = type->Sprite;
+		return;
 	} else {
 		type = unittype;
 	}

src/video/png.cpp

@@ -199,6 +199,7 @@ global Graphic* LoadGraphicPNG(const char* name)
 		return NULL;
 	}
 #ifdef DEBUG
+	DebugLevel3Fn("%10d: %s: %d * %d\n" _C_ w * h _C_ name _C_ w _C_ h);
 	AllocatedGraphicMemory += h * w;
 #endif