misc fixes for MultipleChoiceAttributeField

Bengfort requested to merge multiplechoiceattr into main

fixes #118 (closed) and #122 (closed), but not #128 (closed) refs #138 (closed)

The fundamental question here is whether we want to keep MultipleChoiceAttributeField in the first place.

  • The TSV format used by BIDS does not support nested lists, so it is unclear how to encode multiple values. (In this MR I simply joined the values with commas.)
  • MultipleChoiceAttributeField is not supported on sqlite (#128 (closed))
Edited by Bengfort

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