explain what is required for email ingestion

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@19344 20353a03-c40f-0410-a6d1-a30d3c3de9de

bt5/erp5_crm/bt/comment

-FIXME: email address are not catalogged, so the CMFMailIn doesn't work. ( for now you have to install erp5_dms)
+If you want email ingestion, you have to install erp5_dms_catalog - for the email table.
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bt5/erp5_crm/bt/revision

-148
+150
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