[request] enhanced user[_rql]_callback method, allowing to call other js variant, eg one of userCallback, userCallbackThenUpdateUI, userCallbackThenReloadPage (the default). Also benefit from the new magic js object.

from os.path import join
from cubicweb.toolsutils import create_dir

option_renamed('pyro-application-id', 'pyro-instance-id')

create_dir(join(config.appdatahome, 'backup'))