added submit and displayerrors functions to edit_ad controller
added submit and displayerrors functions to edit_ad controller

Signed-off-by: spelka <28f1340df5c141573d051fbd1d3b47e5826220fa@hotmail.com>

COMP4711-CodeIgniter-TobyCatApps/comp4711assignment,COMP4711-CodeIgniter-TobyCatApps/comp4711assignment,COMP4711-CodeIgniter-TobyCatApps/comp4711assignment