[ENH] Miscelanous improvements
[ENH] Miscelanous improvements

  - Make QI1 mask more robust (closes #276)

oesteban/mriqc,oesteban/mriqc,poldracklab/mriqc,poldracklab/mriqc,poldracklab/mriqc,poldracklab/mriqc,oesteban/mriqc,oesteban/mriqc