addevent.php edit mode

added placeholder for sql queries
set form field values on edit mode
contributeitem.php

form to add a contribution to an item
displayed form field "name" depending on userlogin
max quantity in form field depending on total_qty
addevent.php sql fixing

events in edit mode now call an update instead of insert sql statement
additem.php form redesign

implementation of a form to add a new item to an event