customizable thumbnail sizes

# IMAGES
-------------------------------------------------------------------------------------------------------------------------------------------
'GSIMAGEWIDTH'         => 200,                            // (int)
thumbnail size
'GSTHUMBSMWIDTH'       => 80,                             // (int)
thumbsm max height
'GSTHUMBSMHEIGHT'      => 160,                            // (int)
thumbsm max width

upload.php?regenthumbsm
upload.php?regenthumbnail
will regenerate all thumbs in current folder respectively
missing thumbs are also regenerated on listing, in some cases it may be
better to delete thumbs and let regen as you can keep refreshing until
its done, if exceeding time limts