explicitly close db connections - do not rely on process exit

boot.php

@@ -989,6 +989,7 @@ function autoname($len) {
 if(! function_exists('killme')) {
 function killme() {
 	session_write_close();
+	closedb();
 	exit;
 }}
 

include/dba.php

@@ -212,4 +212,13 @@ function dbesc_array(&$arr) {
 	if(is_array($arr) && count($arr)) {
 		array_walk($arr,'dbesc_array_cb');
 	}
-}}		
+}}		
+
+
+if(! function_exists('closedb')) {
+function closedb() {
+	global $db;
+	if($db && $db->connected)
+		$db->close();
+}}
+

index.php

@@ -326,4 +326,5 @@ else
 	require_once(str_replace($lang . '/', '', $template));
 
 session_write_close();
+closedb();
 exit;