Function: bernreal
Section: transcendental
C-Name: bernreal
Prototype: Lp
Help: bernreal(x): Bernoulli number B_x, as a real number with the current
 precision.
Doc: Bernoulli number\sidx{Bernoulli numbers}
 $B_x$, as \kbd{bernfrac}, but $B_x$ is returned as a real number
 (with the current precision).
