Budget goals specified with periodic transactions (as with
hledger-budget) can now be displayed in balance report (but not in bs/is/cf).
--budget shows the target amount and percentage alongside the actual
amount, per account and period.
Unbudgeted accounts will be hidden, unless --show-unbudgeted is used.
Budgeted accounts are displayed folded (depth-clipped) at a depth
matching the budget specification. Unbudgeted accounts, if shown, are
displayed at their usual depth (in full detail, or according to --depth).
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