Add option to export data between two dates

[ufoloko]

Actually, module allows to export all form records in CSV format.

It should be nice to have an option, that allows to export records between two dates.

Im thinking about to add that option into module for a pull request but I would like to analyze if procedure to retrieve data between two dates is good or maybe can generate some issue or problem in query.

GetRows2.txt

If somebody can check Procedure, i will add the option for push request.