Fixed #7885: Multiple issues with excel/tsv export and subsequent import
dev: Fixed for 2.05 only
dev: it would be best to solve backward compatibility in the model so we don't have to do it for all import/exports separately, check my comment in the survey.php to keep track of changes
Merge branch '2.05' of https://github.com/LimeSurvey/LimeSurvey.git into 2.05