Fix reading from read-only databases with recent versions of postmodern #1238
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Currently copying from read-only databases breaks with recent-enough version of the postmodern library.
marijnh/Postmodern#163 changes the default transaction syntax from
BEGIN
toBEGIN TRANSACTION ISOLATION LEVEL READ COMMITTED READ WRITE
(which corresponds toread-committed-rw
in postmodern). This PR changes the isolation level toread-committed-ro
for read operations.