revised ballgown

tasks/ballgown.wdl

     String cluster
 
     command <<<
-      mkdir -p /cromwell_root/tmp/ballgown
-      cp -r ${sep=" " ballgown} /cromwell_root/tmp/ballgown
-      Rscript /usr/bin/ballgown.R /cromwell_root/tmp/ballgown ${base}.txt
+      mkdir -p /cromwell_root/tmp/${base}
+      cp -r ${sep=" " ballgown} /cromwell_root/tmp/${base}
+      Rscript /usr/bin/ballgown.R /cromwell_root/tmp/${base} ${base}.txt
     >>>
     
     runtime {