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

Creating a renderjs gadget that follows a standard interface
to get, edit and save spreadsheet document using jio. Spreadsheet
gadget is based on onlyOffice editor.
Format of spreadsheet document that can be edited in renderjs gadget
is xlsy. At present the spreadsheet document conversion from any
(xlsx, ods, etc) to xlsy is done automatically during first
synchronization with gadget by cloudooo.

URL navigation of ERP5JS has been fixed and test updated.

This will allow to catch possible errors.