[ntl] hyperbolic functions needed for std::complex...

[Tim Odenthal]

Hi!

I wanted to use ntl's arbitrary precision class RR for complex number 
calculations, but hit a small roadblock, when trying to calculate a 
complex cosine. std::complex needs cosh( RR &)  for that.

Since exp( RR&) is obviously already implemented, I could easily make a 
patch (see below) which now includes both sinh and cosh for the RR 
class. These could probably be improved on, efficiency-wise, and I'd 
like to ask you to check whether I lose precision inadvertently (which I 
doubt).

I send a small test program as well to see that I indeed calculate the 
complex cosine... ;-)

Maybe that patch is useful for someone,

have a nice day

Tim Odenthal

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