introduce a new CubicwebEventManager
Typical emit usage:
>>> from cubicweb import CW_EVENT_MANAGER
>>> CW_EVENT_MANAGER.emit('after-source-reload')
Typical bind usage:
>>> from cubicweb import CW_EVENT_MANAGER
>>> CW_EVENT_MANAGER.bind('after-source-reload', mycallback)
"""cubicweb-%(cubename)s application package
%(longdesc)s
"""