PileupEngine bugfix
PileupEngine bugfix

iontorrent/bamtools,pezmaster31/bamtools,kdmurray91/bamtools,domibel/bamtools,SANBI-SA/bamtools,pezmaster31/bamtools,boratonAJ/bamtools,pezmaster31/bamtools,boratonAJ/bamtools,sksaskrobinsons/code,kdmurray91/bamtools,iontorrent/bamtools,SANBI-SA/bamtools,sksaskrobinsons/code,domibel/bamtools,pezmaster31/bamtools