[NTG-context] Changing font for math function

[Aditya Mahajan]

On Sat, 9 May 2015, Hans Hagen wrote:

> i've added (uploading beta now)
>
> \setupmathematics
>   [functionstyle=\ss,
>    functioncolor=red]
>
> \starttext
> \startformula
>   f = \sin i\omega x^{\sin(x^{\sin(y)})}
> \stopformula
> \stoptext
>
> best test this because Mojca will at some point push into tex live (at 
> which moment we have a current)

Thanks. This works correctly on a small test. I will test this more 
thoroughly.

Aditya