Export file has incorrect spacing in header, caused data set to be incorrectly column-shifted

If you set the export range to the same day, you can an empty dataset because the SELECT statement will look for a range spanning a single second of the day.

Line 145 of download_count/includes/download_count.export.inc:
$row = '"' . $record->dcid . '"' . ', ';

Just to the left of the line-ending '; is an extra space which throws off CSV import parsers. The line should look like this:

$row = '"' . $record->dcid . '"' . ',';

This change should be made for all files within the enclosing while() loop.

I'll post patches later.