develop automated packaging script from input table and list of columns

[benlipkin]

we should handle a couple easy tabular base cases, e.g. pack of csvs with data array, sample meta, neuro meta, etc.

[aalok-sathe]

this is currently failing on voxel-level data.
possibly because the from_file_or_url method doesn't take into account neuroids that are non-existent for certain subjects;