cpow_spec() coverage

specification UnifloatComplex *cpow_spec( CallContext context, UnifloatComplex *x, UnifloatComplex *y )

coverages	branches	failures	hits/fails
C	Some part of arguments is NaN		21
	some part of arguments is infinity		36
	all parts of arguments are normal	failure 13: Requirement failed: {cpow.01;cpow.02} It shall compute the complex power failure 14: Requirement failed: {cpow.01;cpow.02} It shall compute the complex power failure 15: Requirement failed: {cpowl.01;cpowl.02} It shall compute the complex power failure 16: Requirement failed: {cpowl.01;cpowl.02} It shall compute the complex power	63/4
	100% (3/3)		120/4