Bitcoin ABC version 0.31.6 is now available from:
https://download.bitcoinabc.org/0.31.6/
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
with -allowignoredconf to restore the previous behavior of using the datadir
while ignoring the bitcoin.conf contained in it.