Previously, the /orders/:state endpoint only returned the "pending",
"queued", and "sent" states. This patch adds the following new states:
"paid", "transmitting", "confirming", "rx-pending", "retransmitting",
and "received". These are mapped directly to the order status, except
for the "rx-pending" and "retransmitting" states, which are inferred
based on other information. The "rx-pending" state returns orders with
sent status only, as opposed to the call to /orders/sent, which returns
orders with sent and received status. The "retransmitting" state returns
any order with entries on the retransmission database.
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