HOTFIX: ``work_dir`` was not made absolute
HOTFIX: ``work_dir`` was not made absolute

That was confusing the base_directory of reportlets, which were being written under the DataSink folder.
oesteban/fmriprep,poldracklab/fmriprep,poldracklab/fmriprep,oesteban/preprocessing-workflow,oesteban/fmriprep,oesteban/preprocessing-workflow,oesteban/fmriprep,poldracklab/fmriprep,poldracklab/preprocessing-workflow,poldracklab/preprocessing-workflow