Complex functions

The following single-variable functions involving the complex type are also provided.

name	meaning
ComplexD QLA_cexp(ComplexD *a)	$\exp(a)$
ComplexD QLA_csqrt(ComplexD *a)	$\sqrt{a} \ \ \arg(a) \in (-\pi,\pi]$
ComplexD QLA_clog(ComplexD *a)	$\log(a) \ \ \arg(a) \in [0, 2\pi)$
ComplexD QLA_cexpi(RealD a)	$\exp(ia)$