Do not treat the minus sign in the scientific notation as a negative number, and better manage tiny percentages - #836

Summary

• format(1e-19) with the 3-decimal US percentage option returned 10.000%. format(1e-10) returned -1%. The exponent minus was read as the sign.
• Those values are now 0.000%. 0.1 is still 10.000%, and -0.1 is still -10.000%.
• Fixes The format function with the percentageUS3dec predefined option doesn't work properly when the input is a number and is sufficiently close to 0 #792.

Test plan

• On tip, format(1e-19) was 10.000% and format(1e-10) was -1%
• After the change those are 0.000%, and 0.1 is still 10.000%
• Karma unit run was not executed here (it needs a browser). The new spec covers the same format calls

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