New WorkflowMethod implementation. This new implementation solves most issues which existed previously and related to multiple workflows for a single workflow method ID. It should also be faster but will require some more work so that changes in workflow definition are reflected automatically in workflow methods registration. Added support in interaction workflows for once per transaction execution and regular expressions in trigger method IDs.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@15825 20353a03-c40f-0410-a6d1-a30d3c3de9de