- first sort by portal_type, then by int_index, so that it is possible to have same int_index on different portal types of subobjects and have them nicely sorted in view

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@22184 20353a03-c40f-0410-a6d1-a30d3c3de9de