Register queries and show them from snapshots

PUT /queries/NAME takes a module compiled with aup query: the node loads
and verifies it, checks that its states are the app's (names, types,
records) and that it has a view NAME, and keeps it (64 at most; 409 for
another app's module, 400 for bytes that are no module, 404 without the
view). GET /queries/NAME?from=&count= shows that view from the last
save's snapshot with a reader of the query's module, as a declared view
is shown, so a query runs beside writes and sees one save whole. A query
registered again answers anew.

server_queries registers a per-branch total (a correlated fold), a join
of history rows with their accounts and tellers, each rich account's
rank and a filtered count, checks them against a model of the same
transfers, asks while transfers go on, pages, and checks the refusals.

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