wallet.getUnspentOutputs includes the pending field
wallet: rename utxo.receive to utxo.from
wallet: do not overestimate fees when network has dustSoftThreshold
ECSignature: fixes for canonical signatures
wallet: do not delete pending incoming tx from outputs
Merge pull request #219 from weilu/utxo

Wallet fee & utxo fixups
ECSignature: compress assertion statement
ECSignature: add missing tests for R,S length
Merge pull request #220 from dcousens/canonical

ECSignature: fixes for canonical signatures