Clear the columns from dgv on formload, we don't need those.
Refresh the report datagrid view on date change.
Implement the logic to show datagrid view for all children.
Break out the ReportScreen data into a seperate function.
Implement save to CSV.
TODO: for each day, make a new class to display the records in the dgvReport with child displayname, in+in_time, guardian_in, out+out_time, guardian_out, duration.
