[Bf-taskforce25] Units/Dimensions through RNA

[Campbell Barton]

Recently I was thinking that RNA api could be easily used to display
and output units - metric/imperial for buttons defined as distance,
time, volume, weight etc.
My plan is to get this working for RNA button input/output, and after
that maybe use these settings for the view grid and transform numeric
input.

http://wiki.blender.org/index.php/BlenderDev/Blender2.5/DimensionRNA

-- 
- Campbell