composition-rel reform: - apply changes developed by Michael Steigman for making rel-types configurable whether these should be composable or not (default is: these are composable, which was up to now the only choice) - improved documentation of log argument lists of SQL functions - Background: http://openacs.org/forums/message-view?message_id=5330734 http://openacs.org/forums/message-view?message_id=4031049 - bump version number of acs-kernel to 5.9.1d16