More consistent SI names

[nwn]

This crate seems to use a mix of the BIPM and NIST names, such as meter and liter (NIST) instead of metre and litre (BIPM). It simultaneously uses the prefix deca- (BIPM) instead of deka- (NIST).

It think it would be better to either use a single consistent system (like BIPM for everything) or define aliases to support both systems.

(The places where NIST deviates from BIPM are given on page iii of the foreword here: https://www.nist.gov/sites/default/files/documents/2016/12/07/sp330.pdf)

[iliekturtles]

Thanks for the issue and the link to the NIST document. American English spellings of units was explicitly chosen but I didn't realize about "deca" vs. "deka." I'll review and decide what to do about the inconsistencies. I think I'm leaning towards the "deka" prefix, but am not positive yet.

Long term I want to see anything end-user facing localized.

[tgross35]

For what it's worth, I have always used the NIST base names (meter, liter, etc) but never ever seen "dekameter" in use. Looking it up, decameter indeed seems to be the most common spelling https://books.google.com/ngrams/graph?content=dekameter%2Cdecameter%2Cdecametre&year_start=1800&year_end=2019&corpus=en-2019&smoothing=3.