added wifi per-floor optimization

added plot to wifi-quality-analyzer
changes to per-floor wifi models
minor fixes

wifi/estimate/ray3/FloorplanMesh.h

@@ -78,7 +78,7 @@ namespace Ray3D {
 		};
 
 		/** DEBUG: convert to .obj file code for exporting */
-		OBJData toOBJ(const std::string& name) {
+		OBJData toOBJ(const std::string name) {
 
 			bool swapYZ = true;
 			int nVerts = 1;