Income, liability and equity balances, which until now we have
always displayed as negative numbers, are now shown as normally positive
by these reports.
Negative numbers now indicate a contra-balance (eg an overdrawn
checking account), a net loss, a negative net worth, etc.
This makes these reports more like conventional financial statements,
and easier to read and share with normal people.
Compound balance commands like these can now be aware of normal account
balance sign, and sort negative balances accordingly.
This also adds utility-ht as a dependency, only for the uncurry function
right now but it looks potentially useful to have.
