[table view] some new table view enhancements * rewrite entiy table view column renderers to use default_* methods instead of lambda so that column_renderers may be properly deep-copied * new RelatedEntitiesColRenderer * default addcount to false on RelatedEntityColRenderer * more doc

if versions_map['cubicweb'][0] == (3, 7, 4):
    config['http-session-time'] *= 60
    config['cleanup-session-time'] *= 60
    config['cleanup-anonymous-session-time'] *= 60