erp5_workflow_test_data: fix the uncompatibility of copy-paste testing_workflow which comes from workflow module to portal_workflow.

ERP5WorkflowTool.py: modification according to naming conversion; temporary workflow now generated with reference also.

erp5_workflow_test_data: change the id of objects in workflow tool from suffix addition to prefix addition.

erp5_workflow_test_data: redefine testing_workflow, testing_interaction_workflow; add testing_workflow_workflow, testing_interaction_workflow_interaction which are erp5workflow with suffix.

erp5_workflow: replace my_ref with my_reference to automatically add suffix to id. Except for scripts, they still use normal id.

Workflow.py: modify object getter since the id of object has added suffix; add property Reference and variable _isAWorkflow.

InteractionWorkflow.py: add property Reference and varable default _reference, add _isAWorkflow for compatibility.

WorkflowState.py: modify workflow getter since workflow_module has been merged with portal_workflow.