ErrorHandling: added 'err' to callback functions
get_productlist handle errors
get_imagelist handle errors
get_kernellist handle errors
get_locationlist handle errors
get_actionlist handle errors
get_statuslist handle errors
get_vpslist handle errors
get_backuplist handle errors
get_ipv4 handle errors
get_traffic handle errors
vps.details handle errors
vps.action handle errors
vps.actionStatus handle errors
vps.details handle errors