add custom related key as the generic one is using movement table which is not available in banking

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@44796 20353a03-c40f-0410-a6d1-a30d3c3de9de

bt5/erp5_banking_core/CatalogRelatedKeyTemplateItem/related_key_list.xml

+<key_list>
+ <key>explanation_portal_type | catalog/portal_type/z_related_explanation</key>
+</key_list>
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bt5/erp5_banking_core/bt/revision

-565
+559
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bt5/erp5_banking_core/bt/template_catalog_related_key_list

+explanation_portal_type | catalog/portal_type/z_related_explanation
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