[web] fix #724769: Use RemoteCallFailed in the publisher's error_handler On json_request, errors handled by the publisher should raise RemoteCallFailed exceptions instead of standard StatusResponse so that errbacks get called normally on the client side.

usr/lib/python2.4/site-packages/cubicweb/
etc/init.d
etc/cubicweb.d
etc/bash_completion.d
usr/bin
usr/share/doc/cubicweb-ctl
var/run/cubicweb
var/log/cubicweb
var/lib/cubicweb/backup
var/lib/cubicweb/instances