dbug: allow easily printing all subs
dbug: allow easily printing all subs

We had no easy way to print all %incoming or %outgoing subscriptions.
Now, passing ~ instead of [%ship ~zod] or similar, will match all.
ngzax/urbit,urbit/urbit,urbit/urbit,jfranklin9000/urbit,ngzax/urbit,jfranklin9000/urbit,ngzax/urbit,jfranklin9000/urbit,urbit/urbit,urbit/urbit,ngzax/urbit,ngzax/urbit,jfranklin9000/urbit,ngzax/urbit,urbit/urbit,ngzax/urbit,jfranklin9000/urbit,urbit/urbit,urbit/urbit,jfranklin9000/urbit,jfranklin9000/urbit