Make Query and ComplexQuery hashable, so that they can be used as dictionnary key. It is valid as long as nobody use direct access to properties - there is no setter defined - and that extra care is taken not modify variants members which are provided at construction.


git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@15457 20353a03-c40f-0410-a6d1-a30d3c3de9de