Bump to 1.2.8 (#63)

Six changes since 1.2.7, and the reason not to sit on this is #58:
coinbase transactions were not unique, two of them overwrote older ones
on the main chain, and 100 BTF stopped being reachable. Nothing in how
they were built had changed since, so it could happen again at any time.
The height now goes into the coinbase on both paths that build one
(#59, #60), which makes a repeat impossible without any coordination.

Also in: a node now notices a peer it can no longer hear and stays
audible to peers that check the same way (#55); it announces its height
in the handshake and says out loud when it falls behind the network
(#56); script evaluation has ceilings on operation count and stack depth
(#57); the tail of the chain is verified at startup and a bad tip is
backed out of instead of being mined on (#61); and the wallet now
believes the chain about what it has already spent, which is what a
restored backup gets wrong (#62).

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