float CT stringification

[BCS]

Reply to bearophile,

> Fawzi Mohamed:
> 
>> I don't think that you really gain something by making the weight
>> value compiletime, just the sparsity structure (number of variables)
>> makes you gain something...
>> 
> Right, the gain comes only from not doing the multiplication where the
> coefficient is 1, and not doing anything where it's zero.
> 
> Still, I'd like to have a CT toString(float).
> 
> Bye,
> bearophile

look for "fcvt" here http://www.dsource.org/projects/ddl/browser/trunk/meta/conv.d