asinh/acosh/atanh are only partially known to sage

[zimmerma]

sage: asinh(1)
<type 'exceptions.NameError'>: name 'asinh' is not defined
sage: asinh(x)
<type 'exceptions.NameError'>: name 'asinh' is not defined

but:

sage: integrate(1/sqrt(9+x^2), x)
asinh(x/3)
sage: (1.0).asinh()
0.881373587019543

The same holds for acosh and atanh.

[mhansen]

This was fixed in an earlier patch.

sage: asinh(1)
asinh(1)
sage: asinh(x)
asinh(x)
sage: acosh(x)
acosh(x)
sage: atanh(x)
atanh(x)