Add metadata flattening and whitelisting
Add metadata flattening and whitelisting

I've also added flattening and whitelisting for a settings sub-dictionary if/when that gets added to the json load.

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