modify lookupPileup_bath(), lookupPileup_indel_bath():
- add argument('useFlag') : if set, the 'flag' argument will be ignored,
  and search all *.pileup_proc for the corresponding chromosome regardless of the sample name.
- highlights mutations which would be remained after mutScan is highlighted by '[]'
  : default filtering condition (minTotalCover=3, minAltCount=2,minFreq=0.01)
  : any mutation that satisfies the filtering condition will be printed like '[x|y]'