reverted 3d22e3c1: distance.php is old stuff

updates #248

bin/dbsv-update.php

@@ -31,7 +31,7 @@
 		// maintain.php will not fit either.
 	}
 
-	if (!sql_function_exists('distance') || !sql_procedure_exists('sp_touch_cache'))
+	if (!sql_procedure_exists('sp_touch_cache'))
 	{
 		// We need a consistent starting point including triggers & functions, and it's
 		// safer not to decide HERE which trigger version to install.
@@ -320,6 +320,11 @@
 		update_triggers();
 	}
 
+	function dbv_115()  // remove obsolete functions
+	{
+		update_triggers();
+	}
+
 
 	// When adding new mutations, take care that they behave well if run multiple
 	// times. This improves robustness of database versioning.