f0e72dbbfe `Witness` conversion trait impls (Noah Lanson) Pull request description: #1385 Implemented: - `From<Vec<Vec<u8>>>` - `From<&[&[u8]]>` - `From<&[Vec<u8>]>` - `From<Vec<&[u8]>>` ACKs for top commit: tcharding: ACK f0e72dbbfe Kixunil: ACK f0e72dbbfe apoelstra: ACK f0e72dbbfe Tree-SHA512: 87e52c62fb76dc41b9b26cc3faf0046598219b7737287961665ccce006e466ca3616b757b3eeff310127c10c1685d2fd897cfc035f1b4acc1fb48ed963e45930
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