similarly in generate_update_query and generate_remove_query
added: support std::vector<> in Model::field() methods
added: serializing std::vector and std::list for non-model classes in BaseExpression
git-svn-id: svn://ttmath.org/publicrep/morm/trunk@1200 e52654a7-88a9-db11-a3e9-0013d4bc506e