/reviewed-on !269

Fix error display after save
Fix parameters not recognized
Fix python linting
the same way as ERP5 Script Python

Models with workflow state "default" are only considered in composition if no
other valid model is defined. This allows to implement "ingest anything"
policy in wendelin.

Add PortalType field to distinguish different types of Python Scripts, add referencence and use source code editor

Pattern: SIT_1 => RSPL => SIT_1.

Also, this reduces the complexity by not checking objects twice.

Functional Tests: Migration to PDF.js in recent Firefox clears preference to save automatically PDF files to the disk.

- <a href="c"> was not transformed to absolute url
- split the WebPage_exportAsSingleFile and WebPage_extractReferredObjectDict
into two scripts to allow to evaluate string html data.
+ tests

/reviewed-on nexedi/erp5!180