Add ability to format as accounting values (in fmt_*() methods where it makes sense)

[rich-iannone]

We currently don't have the ability to format numeric values as accounting-type values (i.e., handling of negative values different than using the minus sign). This should ideally work inside:

• fmt_number()
• fmt_integer()
• fmt_currency()
• fmt_percent()

As for how it would look, this is a good start:

[JulianCologne]

Great Idea! 😃

Not sure if this is just to show the format but the "percent" value looks wrong 😄 .
Most programms (like excel, powerbi, ...) multiply by 100 and not divide by 10 😮 .

For example you perform a calculation resulting in 0.15 and formatted as percent yields 15% (1 = 100%)

[rich-iannone]

I rescaled the number before applying the percent formatting (to put it in a better range).