`TxGraph::direct_conflicts_of_tx` should just be called `direct_conflicts`

[danielabrozzoni]

See #1064 (comment)

[rustaceanrob]

Before I submit a PR this is just a rename of TxGraph::direct_conflicts_of_tx to TxGraph::direct_conflicts?

[danielabrozzoni]

Before I submit a PR this is just a rename of TxGraph::direct_conflicts_of_tx to TxGraph::direct_conflicts?

Yes, but please either build your PR on top of #1064 or wait for it to be merged before working on this :)