Initial support of email based contribution (new version with cleaner implementation and consistent with ERP5 principle "never change what the user entered"). Remove some actions which are not useful anylonger.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@16985 20353a03-c40f-0410-a6d1-a30d3c3de9de