K 10
svn:author
V 3
das
K 8
svn:date
V 27
2011-10-21T06:29:32.358628Z
K 7
svn:log
V 298
Improved handling of large x in ccosh{,f}():
- Handle cases where exp(x) would overflow, but ccosh(x) ~= exp(x) / 2
  shouldn't.
- Use the ccosh(x) ~= exp(x) / 2 approximation to simplify the calculation
  when x is large.

Similarly for csinh().  Also fixed the return value of csinh(-Inf +- 0i).

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