Bug 8596 - Reports interface date picker doesn't force ISO formatted dates

Bug 8596 - Reports interface date picker doesn't force ISO formatted dates

Datepickers follow Koha's preference for date format, but the
guided reports system doesn't intelligently handle different date
formats. ISO is required. This patch adds some additional
configuration to override the date format.

To test, create a guided or SQL report which takes a date
parameter. The datepicker fields should return an ISO-formatted
date.

Signed-off-by: Nicole C. Engard <nengard@bywatersolutions.com>
Works as advertised.

Signed-off-by: Paul Poulain <paul.poulain@biblibre.com>