Allow administrator to set export field names

[lmullen]

Current when a CSV is exported, the header row contains the field names created in DataScribe. These field names are likely to be human readable rather than machine readable. Perhaps the form builder could contain an option to provide an export name to each field, which would then be used as the field name in the CSV header. Perhaps also the export name could be validated to be machine readable (e.g., no spaces).

This is just a feature idea; no expectation of implementation until we plan for it.