Make an acquisition wrapper for StateChangeInfo when executing a script, so...

Make an acquisition wrapper for StateChangeInfo when executing a script, so that proxy roles work in the context of a workflow.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@6430 20353a03-c40f-0410-a6d1-a30d3c3de9de