Also added an extra range parameter : 'ngt' which stands for 'not greater than'.
'ngt' selects everything that is inferior or equal to the value,
whereas 'max' selects what is strictly inferior to it.


git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@2717 20353a03-c40f-0410-a6d1-a30d3c3de9de