Column aliases

[nx10]

It would be nice if b2t exported the column string IDs as constants:

"ds__dataset", "ent__sub", "ent__ses", "ent__run", "meta_json"

bids2table.DATASET_DATASET
bids2table.ENTITY_SUBJECT
bids2table.ENTITY_SESSION
bids2table.ENTITY_RUN
bids2table.METADATA_JSON

This way they could also have some docstrings explaining what they contain and maybe column datatype attached.

[clane9]

@nx10 I think this is a good idea. More generally, we can think more about how to make the BIDSTable more user-friendly than a vanilla pandas dataframe (although I think it's nice that we can always fall back to dataframe interaction when needed). Would you want to work on this?

[clane9]

#48 adds a get_column_names function which returns an enum listing all column names defined in the schema. In the future, we could consider whether this can be defined statically so that e.g. it is available to intellisense within code editors.