Added silly little program to dump the set of subscriptions registered on an elvind server. Uses the "quench" feature to grab this set. Note that there is no way to just ask for everything, you have to specify the subscription attribute you are interested in. However, since the testbed elvin library wrapper always adds certain fields, just asking for one of these almost certainly gets you everything you are looking for. The only exception (missed items) would be custom subscriptions created directly via the elvin library that do not include one of these common fields. I don't think such subscriptions are ever created in practice.
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