needed for inheritance of testWorkflowMixin class

add workflow method to get transitions list and by id
  getTransitionValueList
  getTransitionValueById

change and rename method to return a dict
create new method to return state object for a given id

changes were also applied to DC workflow, which should not be changed

rename files my_default_expr.xml to my_default_expression.xml
rename default_expr to default_expression in xml files and scripts

ERP5Workflow: add variable to avoid multiple call to function and remove successive 'if/continue' for readability

ERP5Workflow: revert more changes (some Property Sheets have been moved to erp5_workflow bt5, they are back to product/ERP5/bootstrap)

- erp5_test_workflow
  *  add testWorklowMixin test case for inheritance purpose,
  *  move testWorklist ERP5 test to portal_component

author: Wenjie Zheng

- use mixin class to allow reusing common performance functions
- remove usage of quiet and run_all_test

Reduces the number of meaningless 404 errors.

so that we keep the query string in the redirect url if exists.

Instead of only having possibility to check when inventory will be below a reference_quantity,
allow to check when it will be higher.