Adds support for the block height for a requested transaction.
To ensure that all existing transactions on the node have the height
value in the node, please make sure that the node is at least at block
height 424081.
Then:
- make stop
- git pull; make && make release
- rm -rf _build/rel/blockchain_node/data/transasctions.db
- make start. This will load all blocks into the transactions.db again
to populate the height field correctly.