dc_description must accept a 'format' optional parameter. Its default
value must be 'text/plain'. The implementation of dc_descripion
*must* consider this value.

                  - skipping unicode methode for entity.title

Sioc views are generic and should be moved to cubicweb/views (see ticket #224980).

BlogEntryListView has now klass parameter that is invisible by default. BlogEntryListView's klass value is passed to call function. This fix is done to render adequat apparence for similarity box.