[primary sub views] use entity_call instead of cell_call

[doc] get back baseviews documentation into the code, enhance it and reorganize the module accordingly also properly deprecates SecondaryView as it should have been done a while ago.

typo

[reledit] honore 'rvid' for attribute relations (closes #1947471)

[view] fix TypeError when calling req.view('vid', entity=entity) (closes #1947474)

[sources management] nicer source management view and breadcrumbs (closes #1946329) * nice 'add host config button' * table displaying host configuration * display a source's config using <pre> or something like that that respects EOL * configure breadcrumbs for CWSourceSchemaConfig and CWSourceHostConfig

[cubicweb.js] log evalJSON errors (closes #1947473)

[views/table] parametrize table view co-classes (closes #1947472)

[cwproperties] refactor properties form to make it partly overrideable easily (closes #1936782) also fix some pitfalls on the way: * shouldn't capitalize labels, this has to be done in translation files as desired * form_row in CWProperties form didn't return subform as its parent class

[entity] rename Entity._rest_attr_info into cw_rest_attr_info (closes #1942759)