Show Merkle tree

[Giszmo]

For educative mode, showing the Merkle tree in some way would be nice. 4 digits of each tx hash, with full hash onHover. Still would be very wide with 2k tx blocks.

Maybe have the Merkle root expandable to its parent hashes down to the transactions.

Or the reverse: "show Merkle proof" for each transaction?

Or with the horizontal paging to see only 5 steps at a time?

[Giszmo]

$20 from me for a fix. Thumbs up if you want to bump the bounty with an equal amount.