Please add shorter base 1000 suffixes about hfilesize

[stevenxxiu]

Hmm I'm not sure of this one, as in https://en.wikipedia.org/wiki/Binary_prefix it says M is $10^6$, so it might be confusing?

[eugenesvk]

@stevenxxiu

1. wiki says that M is both 10⁶ (SI) and 2²⁰ (JEDEC), so confusion is inevitable and has been there since forever
   Moreover, if you want strict SI compliance, you can't actually get it, because this module has MB instead of M in the si format module and wrong casing for the k in the casing_short

2. if you can't differentiate between M and m there is a trivial solution — don't use this format! I just don't understand why there is no short format for base1000