make number of polygon outputs allowed a constant

settings/settings.php

@@ -33,6 +33,9 @@
 
 	@define('CONST_Suggestions_Enabled', false);
 
+	// Set to zero to disable polygon output
+	@define('CONST_PolygonOutput_MaximumTypes', 1);
+
 	// Log settings
 	@define('CONST_Log_DB', true);
 	@define('CONST_Log_File', false);

website/search.php

@@ -41,8 +41,12 @@
 	   + ($bAsKML?1:0) 
 	   + ($bAsSVG?1:0) 
 	   + ($bAsTEXT?1:0) 
-		) > 1) {
-		echo "Select only one polgyon output option";
+		) > CONST_PolygonOutput_MaximumTypes) {
+		if (CONST_PolygonOutput_MaximumTypes) {
+			echo "Select only ".CONST_PolygonOutput_MaximumTypes." polgyon output option";
+		} else {
+			echo "Polygon output is disabled";
+		}
 		exit;
 	}