Permissions: Created new insert, update, delete restrictions

Set up a new MY_Model that checks permission before allowing users to
insert, update or delete records. Applied to order_model.
Bug Fix: remove edit, delete, create, buttons from interface
Converted common model for permissions.
Clean up code for better user permissions verification
added permissions to flag model
added permissions to grower model
added permissions to image-model
deprecated old user/admin system in favor of ion_auth