Fix IMG_PNG constant error, jquery update, other minor fixes

Big fix with IMG_PNG constant use. Switched to IMAGETYPE_*

Some code cleanup in config files (array, DEFINE->define, etc)

Code cleanup in DB:IO class, especially for consistent returning
array/single data blocks

Some javascript core lib update

www/configs/config.host.php

@@ -12,13 +12,13 @@
 *********************************************************************/
 
 // other master config to attach
-// $__LOCAL_CONFIG = array(
+// $__LOCAL_CONFIG = [
 // 	'db_host' => '',
 // 	'location' => '',
 //	'debug_flag' => true,
 //	'site_lang' => 'en_utf8',
 //	'login_enabled' => true
-// );
+// ];
 
 // each host has a different db_host
 $SITE_CONFIG = [