CHANGES IN VERSION 0.99.2
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  o added elements 'targetCoverageSD' and 'targetCoverageQuantiles' to output of function coverage.target
  o added column 'coverageSD' to 'targetCoverages' output of function coverage.target
  o 'chrom.barplot' can now show fractions of reads and targets per chromosome simultaneously 
  o 'coverage.plot' can now be called repeatedly to show coverage of several samples in one graph
  
