MVP: Handle extra fields to export

[joshuaberetta]

Tasks:

• export basic form with analysis questions and responses
• group survey questions with their associated analysis questions in export
• allow for analysis questions to be toggled on or off for export
• extend test fixtures for analysis forms
• fall back on analysis form question name if translated label not available
• test:
  • works with multiple select in main survey and different types of multiple_select (both, details, summary)
  • analysis form can have select type questions even if the original survey has no select questions
  • formpack internals
  • normal groups
  • form changes across versions
  • auto report ignores analysis questions
  • translations
  • export without analysis fields

Description

Allow for translations, transcriptions and coding questions to be integrated into the export.

Related issues

closes #277

[coveralls]

Coverage increased (+0.7%) to 86.703% when pulling 62df5d9 on 277-additional-fields-exports into abcdced on master.

[joshuaberetta]

@noliveleger do you want to do a final review of the latest changes and then we can try get this merged into master 🙂