Added AddTag/EditTag/RemoveTag methods to BamAlignment. Refactored existing GetTag methods.
Added AddTag/EditTag/RemoveTag methods to BamAlignment. Refactored existing GetTag methods.

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