use 4 threads instead of 8 for overlaps in Celera.
use 4 threads instead of 8 for overlaps in Celera.

EichlerLab/pacbio_variant_caller,EichlerLab/pacbio_variant_caller,EichlerLab/pacbio_variant_caller,EichlerLab/pacbio_variant_caller,EichlerLab/pacbio_variant_caller