aggregate all $$.csv in subfolder during import

Created by: kwenzig

Experience shows, that e.g. a questions.csv-file containing more than one CATI-questionnaire gets very difficult to handle. Therefore a folder structure has been proven to regain the overview:

• questionnaires
  • questionnaire.id1
    • answers.csv
    • questions.csv
    • logical_variables.csv
  • questionnaire.id1
    • answers.csv
    • questions.csv
    • logical_variables.csv etc.

The same holds true for datasets:

• datasets
  • name.dataset1
    • codebook.csv
    • generations.csv
    • variables.csv

It is possibly not a good idea to define a specific structure but the import-process should aggeregate e.g. all questions.csv-Files in all subfolders.