RFA v2: Various enhancements to the fixed-point support implementation

[Joel Brobecker]

> In any case, I think the series looks good.  I let you decide if you
> want to make fixed_point_scaling_factor a method or not, it doesn't
> make a big difference in the end.

Thanks Simon. I pushed all 6 patches to master (including patch #5,
which I think brings better consistency).

-- 
Joel