This was a stealth option only used by the tests, and it isn't useful
any more since `atomic` provides nested transactions.
Backport of 2c40681 from master.
The failure was caused by generating the same warning from two tests.
The second time the same warning was raised it was swallowed by the
"once" simplefilter of warnings.
If the fixture doesn't exist, loaddata will output a warning.
The fixture named "initial_data" is exceptional though; if it
doesn't exist, the warning is not emitted. This allows syncdb and
flush management commands to attempt to load it without causing
spurious warnings.
Thanks to Derega, ptone, dirigeant and d1ffuz0r for contributions
to the ticket.
Aymeric Augustin
Anssi Kääriäinen
Senko Rasic
Florian Apolloner