add unset and ? to repl help message
add unset and ? to repl help message

slamdata/slamengine,djspiewak/quasar,quasar-analytics/quasar,quasar-analytics/quasar,slamdata/slamengine,slamdata/quasar,slamdata/slamengine,quasar-analytics/quasar,quasar-analytics/quasar