Depends on D14575
Add unit tests for sendXec on multi-output txs.
Tx raw hex imported to ElectrumABC to verify txid and fee. Note: the p2sh fee is 1.03 sat/byte due to p2sh not being explicitly covered in ecash-coinselect ... the potential available benefit to nailing down p2sh tx sizes is not material for most use cases, probably why it was not done in original coinselect lib