Merged in rasmusa/snakemake_rule (pull request #337)
Fixes #965 by touching flag files at beginning and end of conda env creation.
Note that the start flag (or similar) is needed to prevent removal of envs from previous Snakemake versions.
Fixes #965 by touching flag files at beginning and end of conda env creation.
Note that the start flag (or similar) is needed to prevent removal of envs from previous Snakemake versions.