Add 'xo-pyutil/' from commit 'a2cb8ae60f'

git-subtree-dir: xo-pyutil
git-subtree-mainline: 219038c445
git-subtree-split: a2cb8ae60f

xo-pyutil/example/ex1/pyex1.cpp

@@ -0,0 +1,14 @@
+/* @file pyex1.cpp */
+
+#include "pyutilexample.hpp"
+#include "xo/pyutil/pyutil.hpp"
+#include <cmath>
+
+namespace xo {
+
+    PYBIND11_MODULE(XO_PYUTILEXAMPLE_MODULE_NAME(), m) {
+        m.def("sqrt", [](double x) { return ::sqrt(x); });
+    }
+}
+
+/* end pyex1.cpp */