* Add user_account_workflow which is associated with Person by default. This workflow allows Assignor, Assignee and Manger to create a user, only if a user login (reference) is empty.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@20430 20353a03-c40f-0410-a6d1-a30d3c3de9de