- automatically create sections and store them with the level data.

- added subsector indexing to sections.

This is needed for finding a section from a point.

src/r_data/renderinfo.cpp

@@ -532,6 +532,8 @@ static void PrepareSegs()
 
 void InitRenderInfo()
 {
+	CreateSections(level.sections);
+
 	PrepareSegs();
 	PrepareSectorData();
 	InitVertexData();