Make guile test suite default to scm api

In other words guilescm becomes guile.
Deprecated gh api tests are moved to guilegh.

Examples/test-suite/guile/guile_ext_test_external.cxx

@@ -0,0 +1,24 @@
+#include <guile_ext_test_wrap_hdr.h>
+#include <imports_a.h>
+
+SCM test_create()
+{
+#define FUNC_NAME "test-create"
+  SCM result;
+  A *newobj;
+  swig_type_info *type;
+  
+  newobj = new A();
+  type = SWIG_TypeQuery("A *");
+  result = SWIG_NewPointerObj(newobj, type, 1);
+  
+  return result;
+#undef FUNC_NAME
+}
+
+SCM test_is_pointer(SCM val)
+{
+#define FUNC_NAME "test-is-pointer"
+  return SCM_BOOL(SWIG_IsPointer(val));
+#undef FUNC_NAME
+}