This commit adds the interactive transaction construction protcol, as
well as the first practical example of using it, v2 of channel
establishment.
Note that for v2 we also update the channel_id, which now uses the hash
of the revocation_basepoints. We move away from using the funding
transaction id, as the introduction of RBF* makes it such that a single
channel may have many funding transaction id's over the course of
its lifetime.
*Later, also splicing
This is a multi-part message in MIME format.
This patch should apply to http://github.com/lightningnetwork/lightning-rfc
Nonidealities:
Aspell triggers spelling errors on the hexadecimal strings in
the test vectors. I don't have enough aspell-fu to figure
out how to make Aspell ignore these.
There are 2 possible pluralizations of `HTLC`: `HTLCs` and
`HTLC's`. I'd prefer the latter, but for now I support both.
We should standardize pluralization; we can edit the
`.aspell.en.pws` file to remove the pluralization we won't
choose.
