testDms: use _baseSetData to replace setData which cause data base conflict? not sure if this is a good solution.

PortalTypeClassInteractor.py: reset accessor/method after reassign workflow through type workflow list.

Workflow.py: fix addTransition errors and add a new combatibility-related function deleteTransitions.

WorkflowTool.py: exclude configuration workflow for the workflow conversion; correct the imput value type for setChainForPortalTypes.

Workflow.py: fix that transition can have single script defined; add a missing function wrapWorkflowMethod.

erp5_workflow: for the sake that workflow view transition/interaction don't show related scripts list correctly; and interaction's trigger methods list doesn't show correcly.

This is still a work in progress

This will ease debugging from posted test results.
This code should be synchronous (no Blob asDataURL method for example) and so, btoa is used.

Sadly, btoa will fail with unicode character
Do not report HTML error in such case, until a cleaner dataURL is implemented