Better period totals formatting

This fixes formatting of period totals and makes it more informative and clear.

Also changes string "Payment, thank you" to just "Payment".
Merge branch 'maint'

* Owner report - better totals formatting, contributed by Amm
Add sale and tax columns

A patch to add support for "Sale" and "Tax" columns in report.
Columns are optional and set to false (#f) by default.