This adds the `--commodity-column` option that displays each commodity
on a separate line and the commodities themselves as a separate column.
The initial design considerations are at
simonmichael.hledger.issues.1559
The single-period balance report with `--commodity-column` does not
interoperate with custom formats.
This changes showMixedAmountElided so that the width to elide to is
given as an argument, rather than fixed at 22 characters. This
actually uses the new renderTable interface. Mostly this is just an
internal change, but since we have more information about the widths
of things, we can actually get rid of some superfluous spaces in the
budget report output, previously there to make sure it stayed aligned
with the largest reasonable contents.
This gives renderTable a little more customisation. Before any of the
commits of this PR, render would just receive a string to display in
each cell. After the second commit of this PR it would also receive a
width of the string (in place of stripping ANSI sequences and then
calculating the width). After this commit, it now also takes an
alignment, so you can make cells left or right aligned. The function
render calls renderTable with appropriate options to give the same
behaviour as before. Also, previously render would always put a border
around the table. We would take this output, and would sometimes strip
the border by dropping the first and last rows, and first and last
characters of every row. I've just added an option to control whether
to put the border in, so we can just not add it in the first place,
rather than stripping it later. Note that this is again just defining
helper functions; this extra power is not yet used anywhere.
