Added license block to AmigaLink captcha engine and set this engine as the default; clarified licensing situation for this module in licenses/index.html
// UK lang variables
tinyMCE.addToLang('layer',{
insertlayer_desc : 'Insert new layer',
forward_desc : 'Move forward',
backward_desc : 'Move backward',
absolute_desc : 'Toggle absolute positioning',
content : 'New layer...'
});