[ReST] settings update: add traceback=True to avoid sys.exit, and set stylesheet to None since we don't care about it and that may makes docutils stupidly fail according to the cwd at import time...

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