Change output check to do busy waiting instead of checking only at the end.
Change output check to do busy waiting instead of checking only at the end.

pascal-git/snakemake,pascal-git/snakemake,gusevfe/snakemake,gusevfe/snakemake,gusevfe/snakemake,pascal-git/snakemake,gusevfe/snakemake,pascal-git/snakemake