[Patches] acosh and asinh functions

[Nadav Horesh]

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The computation of the inverse hyperbolic functions 'acosh' and 'asinh'
is erroneous -- it has both low precision and discontinuities.

The patch (using diff) is followed:
====================================================================
60,61c60,63
<  return c_log(c_sum(x,c_prod(c_i,
<       c_sqrt(c_diff(c_1,c_prod(x,x))))));
---
>   Py_complex z;
>   z = c_sqrt(c_half);
>   c_temp = c_log(c_prod(z, c_sum( c_sqrt(c_sum(x,c_1)),
c_sqrt(c_diff(x,c_1)))));
>   return c_sum(c_temp,c_temp);
89,90c91
<  z = c_diff(c_sqrt(z),x);
<  return c_neg(c_log(z));
---
>   return c_log(c_sum(c_sqrt(z),x));
338c339
<   PyErr_SetFromErrno(PyExc_ValueError);
---
>   PyErr_SetFromErrno(PyExc_ValueError);
414c415
<
---
>
422c423
< }
---
> }
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