[datafeed] don't allow arbitrary kwargs on DatafeedParser initializer
else they will be handled nicely by appobject base class, while we rather want an
error in the case of a source parser (arguable).
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/html/index.html
Files: /usr/share/doc/cubicweb-documentation/html/*