This adds some compatibility between old naming and new naming (SQL vs. Sql). It also fixed asSQLJoinExpression so that domain trees may work again. This fix is a quick hack. The appropriate approach is to refactor the querying mechanism alltogether with queries in the catalog.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@12051 20353a03-c40f-0410-a6d1-a30d3c3de9de