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.

Mostly, header gadget is rendered after the main gadget.
Remove many zelenium 'pause' command, by waiting for the expected element instead.

This is an adhoc URL command to support creation of new ERP5 document while keeping the global history usable.
Clicking on the 'back' icon on the newly created document will redirect to the parent document.

testERP5Security shows that owner queries must be done with ExactMatch

 ... so that we have setup's error message

This relies on selecting preferences using owner= catalog key.
This way also supports the edge case where the user has a "Owner" role defined in acl_users.

Also fix some comments