* add SelectionTool.buildSQLExpressionFromDomainSelection()
* please use these methods instead of selection_domain.asSQLJoinExpression
  and selection_domain.asSQLExpression.
* to pass a DomainSelection instance to these methods is
  deprecated. please use a domain dict instance to these methods
  instead.


git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@13092 20353a03-c40f-0410-a6d1-a30d3c3de9de