Revert dwgsim samtools version back to 0.1.18 to resolve compile problems
Revert dwgsim samtools version back to 0.1.18 to resolve compile problems

kdaily/cloudbiolinux,elkingtonmcb/cloudbiolinux,AICIDNN/cloudbiolinux,lpantano/cloudbiolinux,lpantano/cloudbiolinux,rchekaluk/cloudbiolinux,rchekaluk/cloudbiolinux,averagehat/cloudbiolinux,joemphilips/cloudbiolinux,pjotrp/cloudbiolinux,rchekaluk/cloudbiolinux,heuermh/cloudbiolinux,heuermh/cloudbiolinux,AICIDNN/cloudbiolinux,heuermh/cloudbiolinux,chapmanb/cloudbiolinux,kdaily/cloudbiolinux,elkingtonmcb/cloudbiolinux,joemphilips/cloudbiolinux,chapmanb/cloudbiolinux,chapmanb/cloudbiolinux,pjotrp/cloudbiolinux,kdaily/cloudbiolinux,elkingtonmcb/cloudbiolinux,rchekaluk/cloudbiolinux,pjotrp/cloudbiolinux,averagehat/cloudbiolinux,heuermh/cloudbiolinux,pjotrp/cloudbiolinux,lpantano/cloudbiolinux,averagehat/cloudbiolinux,elkingtonmcb/cloudbiolinux,joemphilips/cloudbiolinux,kdaily/cloudbiolinux,AICIDNN/cloudbiolinux,chapmanb/cloudbiolinux,AICIDNN/cloudbiolinux,joemphilips/cloudbiolinux,averagehat/cloudbiolinux