[db-wg] Support for recursive expansion of as-set to a list of ASNs

Dear DB-WG,

Now that the new database backend is in place, this should allow for
awesome features such as server sided recursion of AS-SETs into a list
of ASNs.

Implementing IRRd's !i flag will prevent a lot of back and forth
communication between whois server and client to provide the client with
a full list of ASNs which are part of an AS-SET. Clients such as bgpq3
support this flag. 

I've filed an enhancement request on github: 

    https://github.com/RIPE-NCC/whois/issues/72

But we could use this thread to assess community support and gather a
sense of priority. 

Kind regards,

Job
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