Configuration
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- `bitcoind` and `bitcoin-qt` will now raise an error on startup if a datadir that is being used contains a bitcoin.conf file that will be ignored, which can happen when a datadir= line is used in a bitcoin.conf file. The error message is just a diagnostic intended to prevent accidental misconfiguration, and it can be disabled to restore the previous behavior of using the datadir while ignoring the bitcoin.conf contained in it.