Handling multi-task datasets - suggestion for input format, help improvements

[christinerogers]

Suggested by EEGManyLabs/GBC input (per JBB)

• biometric data (sex, age, handedness, etc.) could come in an EXCEL file, where all these data are specified. In that file, there would be one row per subject, which includes path, name, subject_id, session, task, run, etc.

• Tool could make the naming conversion and not obligate the user to write the names in a specific format. That will allow adding as many subjects with data as I have, in just one run of the program.

• the immersive help: there are many JSON files that need to be specified. The immersive help should say which is the content of this file and probably an example.