Ikonize

<?php
/**
 * This function updates users that are using 2.x versions to
 * the 3.x versions.
 *
 * 1. The four project meta labels were removed and replaced with
 *    a single field that allows creating arbitrary labels.
 *    If user's post contains the old labels and the new custom field
 *    "daisho_project_meta" is empty, move the labels to this new field.
 *    This is run on every front-end and back-end post opening.