Many thanks, Daniel.

> The patch against the trunk failed for PC/VC6/pythoncore.dsp.  I don't
> need that to build, though.

I've no idea why that would happen.  A line-ending issue, perhaps?  If 
it doesn't stop me committing the change, then perhaps it's not a 
problem.

> Your patch built fine, with one warning about a loss of precision on
> the following line in sinpi():
>
>    n = round(2.0*y);
>
>I recommend explicitly casting the result of round() to int, to get
>rid of the warning and because explicit is better than implicit. :)

Done.  Thanks!