Select-multiple questions in NLP analysis don't respect export settings

[esario]

Description

Select-multiple questions in the transcript analysis section always export in one column as comma-separated regardless of export settings ("Export Select Many questions as…" {single column | separate columns | single and separate columns}

Steps to Reproduce

1. Create a survey with an audio question and submit once
2. Open the audio transcription/transcription/analysis view from the Data -> Table view
3. Create a select-multiple question in the Analysis tab
4. Select at least two options for that question for the submission and save
5. Export the data with separate columns or single and separate columns selected under the Export Select Many questions as… setting

Expected behavior

Export respects the export settings: when selecting separate columns option, the export contains a separate column for each answer option and codes the answers with ones and zeros.

Actual behavior

The select-multiple answers show up in one column as comma-separated values

[jnm]

Note to the investigator: this may require a code change in https://github.com/kobotoolbox/formpack/