h_format_number: Conditional Formatting Using C-style Formats
Description
This helper function conditionally formats a number with formatC()
function using "E" format and specific number of digits as given by the
user. A number is formatted if and only if its absolute value is less than
0.001 or greater than 10000. Otherwise, the number is not formatted.
Additionally, custom prefix or suffix can be appended to character string
with formatted number, so that the changes are marked.