erp5_workflow_test_data: Rename dc_test_workflow to testing workflow; creat a testing_workflow in ERP5 workflow for test; add testValidationFailed; improve testCheckHistoryForASingleTransition.

erp5_property_sheets: Add Guard property in Transition_property_sheets. Modify the type of the erp5_workflow_list_property from multiselection to string-multivalues.

Transition.py: Now generate workflow history for both Action and Workflow Method, add Guard Object in real time, improve state getters.

Transition.py: Remove duplicated WorkflowHistoryList class definition, import same class from WorkflowTool.py instead.

erp5_workflow: change the test name from testerp5anddcworkflow to testWorkflowAndDCWorkflow and the ERP5Workflow Test Object to ERP5Workflow Test Document, replace a _getOb in test script.

PythonScript.py: Delete _params if it's an empty string, to avoid NoneType parameters from generating.

testERP5Security.py: avoid test from deleting workflow module by error, add erp5workflow method compability.

erp5_base: change delete transition name in erp5_workflow to avoid comflit with transition has the same name in DCworkflow used by the same portal type.

erp5_property_sheets: add managed_permission_property to fix permission_role matrix generation error.