Set coin selection to "privacy" by default in Electrum
Originally created by @mjenglish on #12177 (Redmine)
“Attempts to better preserve user privacy. First, if any coin is spent from a user address, all coins are. Compared to spending from other addresses to make up an amount, this reduces information leakage about sender holdings. It also helps to reduce blockchain UTXO (unspent transaction outputs) bloat, and reduce future privacy loss that would come from reusing that address’ remaining UTXOs. Second, it penalizes change that is quite different to the sent amount. Third, it penalizes change that is too big.”
https://mailman.boum.org/pipermail/tails-dev/2017-January/011198.html
Feature Branch: feature/12177-electrum-privacy-coin-chooser