erp5_core: Base_getWorkflowHistoryItemList get object reference instead ot id to generate workflow history.

erp5_core: history generation script gain compatibility of both type of workflow by deploying universal methods.

erp5_workflow: in configuration workflow, replace field state_base_category with state_variable_name. this modification related to Nameing conversion unittest.

WorkflowTool.py: now converted workflow can have the same ID as old DCWorkflow, and old DCWorkflow will be moved to trash tool.

Workflow.py: in showAsXML, iff show variable's expression as getId when variable is action, and it has default_expr.

WorkflowTool.py: add variable's expression as getReference iff when variable is action and it has a default_expr.