[FIX] Compression on DataSinks
[FIX] Compression on DataSinks

This PR tries to fix #1075 for good.

oesteban/preprocessing-workflow,poldracklab/preprocessing-workflow,poldracklab/fmriprep,poldracklab/fmriprep,oesteban/fmriprep,oesteban/fmriprep,poldracklab/fmriprep,poldracklab/preprocessing-workflow,oesteban/fmriprep,oesteban/preprocessing-workflow