-N doesn't seem to be used by Ledger currently; we'll
use it as shortcut for --no-total.
-T is used by Ledger to set a custom value expression for the final
total. I'm going to take it as a shortcut for --row-total instead.
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).
