Consider using target=_blank for models as well

I think is useful to have target="_blank" for models too, e.g.:
# This is a sample from MENU configuration:
'models': [
             'core.proxyservice',
             'core.dnsservice',
             'core.servicecategory',
             {'label': 'Sandbox',
              # 'url': 'javascript:window.open("/console/sandbox_preview/","_blank")',
              'url': '/console/sandbox_preview/',
              'blank': True},
]