dashboard: the transport each message went by, in the console

The console said with whom a message went, not how: the message log was noted above
the identity layer (`CountingTransport`), where a message is to or from a node, and the
address it went to (the paths layer picks one, `Paths::send_first`) or came from is
gone. Only the paths layer's own PINGs and PONGs, logged under their addresses, had one.

Now the identity layer notes the node's messages (`MessageLog::set_addressed`), with
the address each went to (`IdentityTransport::send_proven` returns it) or came from;
`CountingTransport` leaves them to it, and still notes them where there is no identity
layer (tests). A console line ends with the transport (the address's scheme, in its
colour on the map, the address in the tooltip), and the figures box shows the address.
A subscribed node's messages carry theirs too, and the map runs every message along
its transport's line, not only the PINGs and PONGs.

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