[datafeed] Allow to override use_cwuri_as_url in configuration of a datafeed source
This is necessary because in some case one will want to write parser which
create entities not one-to-one related to entities from the distant source (for
instance see the `vcrs` cube which create entities holding statistics for code
review, while not importing review entities themselves).
Ideally we should provide a way to the parser to indicate the source that cwuri
should not be used, but that's a start...
Closes #3670210
Document: cubicweb-doc
Title: CubicWeb documentation
Author: Logilab
Abstract: Some base documentation for CubicWeb users and developpers
Section: Apps/Programming
Format: HTML
Index: /usr/share/doc/cubicweb-documentation/index.html
Files: /usr/share/doc/cubicweb-documentation/*.html