changes

FMT_ENG stands for "format string for ENGineering units used out in the file". A

define is needed simply to provide consistency across many sites of usage. BIUs

will be scaled before being written to disk in every most every case, and since

will be scaled before being written to disk in most every case, and since

scaling is a multiplication, it means casting one of the factors to BFU, and

then this product is output with a printf() style function using the FMT_ENG

string segment.

That is, the FMT_ENG will be suitable for use with a BFU type. When BFU is set

to double, then FMT_ENG will be set to "%.6g". When BFU is set to long double

then FMT_ENG will be set to "%.6lg". For example:

then FMT_ENG will be set to "%.6Lg". For example:

#if USE_DOUBLE_BFU

typedef double          BFU;