- Update to version 1.13:
* xml_attribute::set_value, xml_node::set_value and xml_text::set
now have overloads that accept pointer to non-null-terminated
string and size.
* Fix error handling in xml_document::save_file that could result
in the function succeeding while running out of disk space.
* Fix memory leak during error handling of some out-of-memory
conditions during xml_document::load.