Runtime unit lib

[BCS]

I have put together a runtime unit type library. While I was writing the 
unittest I recognized that the most likely error is an error in the convention 
table (something that can't be checked by the person who wrote that part). 
Therefor, Would someone please (without looking at my table of conversion 
factors) finish writing the unittest for the lib?

It shouldn't be hard, just get the file and a units conversion table and add 
some more lines like those around line 644.

here it is:

http://www.webpages.uidaho.edu/~shro8822/unit_.d

ps:

I am submitting this for inclusion in Phobos.