Remove useless SaleOpportunity property sheet, which was not used.
Add Price property sheet to SaleOpportunity, in order to define price range.
Add Amount property sheet to SaleOpportunity, in order to define product_line.
Thanks to Thierry Brettnacher.


git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@11167 20353a03-c40f-0410-a6d1-a30d3c3de9de