* Optional 'locale' arg to format_money
- Allows override of system locale when generating reports
* Updated documentation
* Add unit tests
* Handle invalid locale
* Handle invalid locale
* Add new global setting to control currency locale in reports
* Use setting in reports
* Add CHANGELOG entry
* Further unit tests
* Add unit tests for new setting
* Update docs
* More docs
* Refactoring:
- Change REPORT_CURRENCY_LOCALE to REPORT_LOCALE
* Extend unit testing
* Refactor format_number
* Add unit tests for explicit format strings
* Update examples for format_date
* Updated unit tests
* Cleanup unit tests
* Fix more tests
* Adjust wording
* Remove global setting - simplify code
* Simplify unit tests
* Revert 'min_digits' to 'leading'
* Fix docs
* Refactor the render_currency function
- Move all functionality into report.py
* Cleanup duplicate code
* Updated docs
* Allow user to specify date_format
* Add support for 'leading' digits in render_currency
* Bug fix
* Fix unit test
* Add tests for "include_symbol"
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