prep for 2023. Fixed many bugs. Added pdf guide

vendor/phpoffice/phpspreadsheet/bin/migrate-from-phpexcel

@@ -0,0 +1,8 @@
+#!/usr/bin/env php
+<?php
+use PhpOffice\PhpSpreadsheet\Helper\Migrator;
+
+require_once __DIR__ . '/../src/Bootstrap.php';
+
+$migrator = new Migrator();
+$migrator->migrate();