add of python script to check acos(complex)

tests/dev/test_acos.py

@@ -0,0 +1,4 @@
+#!/usr/bin/env python
+import cmath
+x = complex(0.42312341412412398237, 1.32312314124141232987987)
+print("value x=",x," acos(x)=", cmath.acos(x))