somewhat unclean code, sorry... but it allows opening brushPrimitives maps in nonBrushPrimitives mode (experimental) by temp toggling to the correct mode

include/imap.h

@@ -61,6 +61,7 @@ class MapFormat
 public:
   INTEGER_CONSTANT(Version, 2);
   STRING_CONSTANT(Name, "map");
+  mutable bool wrongFormat;
 
   /// \brief Read a map graph into \p root from \p outputStream, using \p entityTable to create entities.
   virtual void readGraph(scene::Node& root, TextInputStream& inputStream, EntityCreator& entityTable) const = 0;