create get_site_info() function so we can have a siteinfo.json module instead of or actually in addition to siteinfo/json

mod/siteinfo_json.php

@@ -0,0 +1,8 @@
+<?php
+
+function siteinfo_json_init(&$a) {
+
+	$data = get_site_info();
+	json_return_and_die($data);
+
+}