remove strong dependancy, this is a mistake

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@20619 20353a03-c40f-0410-a6d1-a30d3c3de9de

bt5/erp5_trade/bt/dependency_list

 erp5_core
 erp5_base
-erp5_pdm>=1.0rc6
+erp5_pdm
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bt5/erp5_trade/bt/revision

-308
+309
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