Bug 19716: Add option to send header line for CSV output

Bug 19716: Add option to send header line for CSV output

Currently, if outputting a CSV file using runreport.pl, you need to look at the report used to know what each column means. It would be nice if we could include column headers.

Test Plan:
1) Apply this patch
2) Try using runreport.pl with --format csv --csv-header

Signed-off-by: David Bourgault <david.bourgault@inlibro.com>
Signed-off-by: Julian Maurice <julian.maurice@biblibre.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>