BF: Use unique filenames for DAGMan workflows
BF: Use unique filenames for DAGMan workflows

Allows for multiple concurrently running DAGs, and is necessary due to
the use of -update-submit in the DAGMan call.

mick-d/nipype,pearsonlab/nipype,iglpdc/nipype,arokem/nipype,glatard/nipype,dgellis90/nipype,carlohamalainen/nipype,JohnGriffiths/nipype,gerddie/nipype,JohnGriffiths/nipype,JohnGriffiths/nipype,dmordom/nipype,carolFrohlich/nipype,sgiavasis/nipype,Leoniela/nipype,FCP-INDI/nipype,carlohamalainen/nipype,pearsonlab/nipype,iglpdc/nipype,mick-d/nipype_source,dgellis90/nipype,pearsonlab/nipype,FCP-INDI/nipype,dmordom/nipype,dgellis90/nipype,gerddie/nipype,FredLoney/nipype,Leoniela/nipype,mick-d/nipype_source,grlee77/nipype,rameshvs/nipype,rameshvs/nipype,mick-d/nipype,JohnGriffiths/nipype,glatard/nipype,gerddie/nipype,grlee77/nipype,blakedewey/nipype,arokem/nipype,FCP-INDI/nipype,rameshvs/nipype,pearsonlab/nipype,iglpdc/nipype,carolFrohlich/nipype,FredLoney/nipype,gerddie/nipype,wanderine/nipype,mick-d/nipype,carolFrohlich/nipype,rameshvs/nipype,sgiavasis/nipype,wanderine/nipype,dgellis90/nipype,FredLoney/nipype,FCP-INDI/nipype,fprados/nipype,sgiavasis/nipype,grlee77/nipype,arokem/nipype,wanderine/nipype,blakedewey/nipype,Leoniela/nipype,mick-d/nipype,carlohamalainen/nipype,blakedewey/nipype,grlee77/nipype,wanderine/nipype,carolFrohlich/nipype,mick-d/nipype_source,blakedewey/nipype,glatard/nipype,fprados/nipype,iglpdc/nipype,arokem/nipype,sgiavasis/nipype,fprados/nipype,dmordom/nipype,glatard/nipype