documented CAP::MessageStack failure with yaml session serializer unless YAML::Syck installed; field content checks for gallium_data.pl; report_link_options.tt amended to work with authorisation function disabled

added new function to require confirmation when reporting with outstanding test results; moved C::Report::_get_requested_tests() to C::Roles::ResultHandler; converted some template data objects to as_tree hashrefs to prevent db lookups when empty; fixed some tests to comply with new confirm_outstanding_results flag

changed trigger & procedures definitions; new t/triggers.t