Support metric prefixes for SI notation

Originally reported on Google Code with ID 497

Allow the entry of metric prefixes for SI units of measure into an equation, and output
it using SI prefixes if enabled by the user.

For example, entering "10e-9", could be entered as 10n (i.e. 10nano) or 1e6 could be
entered as 1M; 1.32e3 as 1.32k etc". When answers are calculated, it can be much nicer
to see a result as 12u, instead of 1.2e-5

Please note, this is not a request to support SI units (meters, newtons etc), only
SI prefixes.

See http://en.wikipedia.org/wiki/SI_prefix#List_of_prefixes for standard SI units of
measure.

Reported by KaneEvansMcLeod on 2014-04-04 21:03:43

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