Add a dependancy to erp5_core (>1.0rc12), because erp5_base uses proxy field libraries

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@15889 20353a03-c40f-0410-a6d1-a30d3c3de9de

bt5/erp5_base/bt/dependency_list

+erp5_core (>1.0rc12)
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bt5/erp5_base/bt/revision

-146
+147
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