You can now write both @/@@ costs and corresponding equity conversion postings
in a transaction at any time, not just when using --infer-costs or --infer-equity.
hledger will recognise the redundancy and ignore it.
One thing has become more strict: hledger now requires conversion postings
to occur in adjacent pairs; an odd number of them is not allowed.
(Conversion postings are postings to accounts of type `V`/`Conversion`,
or named `equity:conversion`, `equity:trade`, `equity:trading`,
or subaccounts of these.)
And, --infer-costs now works in transactions with an implicit amount
(inferring costs from equity now happens after transaction balancing,
not before).
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