Fixed issue #109. std::string is serialized/deserialized in XML with CDATA node.
Extended the fix for issue #109 and added a test.
Reverted changes in xml.hpp for issue #109.
Another attempt to fix issue #109 now for any type that can contain whitespaces
make isWhitespace xml_detail function instead of member
Merge branch 'volo-zyko-master' into issue_109