Periodic, cumulative and historical multicolumn balance reports are now
generated by one code path, which helps with consistency and reducing
the bug/test surface. --tree now also works with --cumulative or
--historical.
Multicolumn balance reports can now be switched to a hierarchical view
with --tree. This is similar to the single column balance report with
--no-elide, ie we do not elide boring parents into the following line.
The --flat and --tree flags are opposites; the last one to appear on
the command line is decisive (in future, if not already).
Changes include:
- flat mode now shows exclusive (subaccount-excluding) balances.
This is a deviation from ledger, but seems simpler and clearer
for users and implementors across the various modes.
- in flat mode, --depth now aggregates deeper accounts at the
depth limit, rather than just excluding them from the report.
This is more useful.
- in flat mode, --empty no longer shows parent accounts with
no postings.
- more tests, more debug output, clearer code
