RT issue #44461 (lo functions and AutoCommit)

  Hi,

About the issue mentioned here:
https://rt.cpan.org/Public/Bug/Display.html?id=44461
and the corresponding fix, I'd like to point out that it may break 
existing code. For instance, consider this sequence of instructions:

$dbh->{AutoCommit}=1;
$dbh->do("BEGIN");
my $oid=$dbh->func($file, 'lo_import');
# other things...
$dbh->do("ROLLBACK");

With the current version of DBD::Pg I have (2.8.2), it outputs no error 
and rollbacks the lo_import (no new entry gets created in 
pg_largeobject)

But with the latest SVN, it outputs these messages:
  WARNING:  there is already a transaction in progress
  NOTICE:  there is no transaction in progress
and the lo_import gets committed instead of rolled back.

Best regards,

-- 
 Daniel
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