unit type for addition to std lib [was Re: D Language 2.0]

[BCS]

Hello bearophile,

> BCS:
> 
>> Because you complained I added the other two, but because I think
>> they are silly I make it so you can switch them on and off (they are
>> placed under a "version(FullSI)").
>> 
> What's the definition of "silly SI units"?
> 

Base SI units that are or can be defined in terms of other SI base units: 
mole and candela

SI is the only unit system that has them.

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