Consider the following transaction:
2010-06-22 Sample
Assets:Brokerage 10 AAPL {$30}
Assets:Brokerage
Previously, this would have been equivalent to:
2010-06-22 Sample
Assets:Brokerage 10 AAPL @ $30
Assets:Brokerage
However, this is not always what the user expects to happen. When @ is
not being used, the transaction should reflect a mere transfer of
commodities. This is now how it works, and thus the above transaction
is now equivalent to the following instead:
2010-06-22 Sample
Assets:Brokerage 10 AAPL {$30}
Assets:Brokerage -10 AAPL {$30}
