8.4.6 flagLon(self,channel=-1,phase=-1,below='?',above='?',flag=1):

flagLon $<$ DataAna(BoaDataEntity.DataEntity): $<$ BoaDataAnalyser.py

    NAM: flagLon (method)  
    DES: Flag data in azimuth offset (longitude) interval
    INP: 
         (i) channel  =  -1: all channels; 0=first channel
         (i) phase    =  -1: all; else: 0,1,2
         (f) below    = flag data below and above
	 (f) above    = flag data ...