Enable / Disable debugging 
		
		:param bool onOff: turn debugging on / off
		:return: none

def debug(self,onOff,level='DEBUG'):
		'''
		Enable / Disable debugging 
		
		:param bool onOff: turn debugging on / off
		:return: none
		'''
		if onOff:
			if level == 'DEBUG':
				self.log.setLevel(logging.DEBUG)
				self._ch.setLevel(logging.DEBUG)
				self.log.debug("Debugging level DEBUG enabled")
			elif level == "INFO":
				self.log.setLevel(logging.INFO)
				self._ch.setLevel(logging.INFO)
				self.log.info("Debugging level INFO enabled")
			elif level == "WARN":
				self.log.setLevel(logging.WARN)
				self._ch.setLevel(logging.WARN)
				self.log.warn("Debugging level WARN enabled")
			elif level == "ERROR":
				self.log.setLevel(logging.ERROR)
				self._ch.setLevel(logging.ERROR)
				self.log.error("Debugging level ERROR enabled")
		else:
			self.log.setLevel(logging.ERROR)
			self._ch.setLevel(logging.ERROR)
			self.log.error("Unrecognized debug level `%s`, set to default level `ERROR` instead",level)