keep into account that we generate 2 strands per read
keep into account that we generate 2 strands per read

[git-p4: depot-paths = "//sw/gpgpu/nvbio/internal/": change = 18315979]

kimrutherford/nvbio,NVlabs/nvbio,NVlabs/nvbio,NVlabs/nvbio,kimrutherford/nvbio,kimrutherford/nvbio,NVlabs/nvbio,kimrutherford/nvbio