Fix world saver treating lines as sprites (Secretchronicles#116).

Actually, there ARE a cSprite subclass, but with no image attached.
They should probably be no sprites at all.

Author: Quintus

smc/src/overworld/overworld.cpp

@@ -58,7 +58,7 @@ cOverworld_description :: ~cOverworld_description( void )
 
 void cOverworld_description :: Save( void )
 {
-	fs::path filename = pResource_Manager->Get_User_World_Directory() / m_path / utf8_to_path("description.xml");
+	fs::path filename = pResource_Manager->Get_User_World_Directory() / m_path.filename() / utf8_to_path("description.xml");
 
 	try {
 		Save_To_File(filename);

smc/src/overworld/world_layer.cpp

@@ -75,6 +75,14 @@ cLayer_Line_Point :: ~cLayer_Line_Point( void )
 	}
 }
 
+xmlpp::Element* cLayer_Line_Point :: Save_To_XML_Node(xmlpp::Element* p_element)
+{
+	// Do NOT call parent class’ method as we are no real sprite.
+	// We are being saved into the world description file, so no
+	// need to duplicate nonsensical entries in world.xml.
+	return NULL;
+}
+
 void cLayer_Line_Point :: Draw( cSurface_Request *request /* = NULL */ )
 {
 	if( m_auto_destroy || !pOverworld_Manager->m_draw_layer )

smc/src/overworld/world_layer.hpp

@@ -36,6 +36,8 @@ class cLayer_Line_Point : public cSprite
 	// destructor
 	virtual ~cLayer_Line_Point( void );
 
+	virtual xmlpp::Element* Save_To_XML_Node(xmlpp::Element* p_element);
+
 	// draw
 	virtual void Draw( cSurface_Request *request = NULL );