add another debug message to help with https://trac.osgeo.org/grass/ticket/1452 (merge from devbr6)

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@48531 15284696-431f-4ddb-bdfa-cd5b030d7da7

general/g.proj/datumtrans.c

@@ -47,7 +47,9 @@ int set_datumtrans(int datumtrans, int force)
 	return 0;
 
     status = GPJ__get_datum_params(projinfo, &datum, &params);
+    G_debug(3, "set_datumtrans(): GPJ__get_datum_params() status=%d", status);
     G_free(params);
+
     if (datum) {
 	/* A datum name is specified; need to determine if
 	 * there are parameters to choose from for this datum */