The makeflow command for md5sum is too long for the cluster

The command for md5sum sent by Makeflow contains the paths of all samples. In 2 of our workflows, there are 672 samples, that is far too long to be accepted for the cluster.

2018/12/04 12:47:55.67 makeflow[46806] notice: job submission failed: no output from slurm couldn't submit batch job, still trying...