fsqueue no longer stores envelopes by dumping the structure, instead use a

couple of load/dump functions to convert to and from a human readable fmt.
while at it kill struct delivery and merge back its fields to the envelope.

this basically means we shouldn't require users to flush their queues every
time we make a change to struct envelope.

work is not done, but we're at a better state than the binary fsqueue so
we'll improve it in-tree.

has been running on my own box for the last 12 hours or so
ok eric@, chl@

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