add option so operators can be called with a flag, currently the only flag is to respect hidden geometry.

this is useful for bmesh tools that operate in object mode or for modifiers which would previously use hidden faces in some cases.

source/blender/python/bmesh/bmesh_py_ops.c

@@ -109,7 +109,8 @@ static PyObject *pyrna_op_call(BPy_BMeshOpFunc *self, PyObject *args, PyObject *
 	}
 
 	/* TODO - error check this!, though we do the error check on attribute access */
-	BMO_op_init(bm, &bmop, self->opname);
+	/* TODO - make flags optional */
+	BMO_op_init(bm, &bmop, BMO_FLAG_DEFAULTS, self->opname);
 
 	if (kw && PyDict_Size(kw) > 0) {
 		/* setup properties, see bpy_rna.c: pyrna_py_to_prop()