Previously, if you specified no report interval, the text output of
these commands was a simple report like the original balance command,
with amounts on the left and account names on the right. Also,
balances used arithmetic sign like the balance command.
Now it always draws a table, with account names in the left
column, and shows balances with normal-positive sign, consistent with
the multicolumn reports. Less code, fewer bugs.
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.
* Add an option to use unicode in balance tables
fixes#522
* Add a test for unicode tables
* Document --pretty-tables
* Support --pretty-tables in BalanceView
