Add a small margin to the off-screen post pop-up.

Without this margin you have to keep your mouse very still while
hovering a post quote for a post that is off-screen, otherwise, by
placing the mouse on the pop-up itself, the mouseover event is triggered
and the pop-up disappears, making for a very annoying user experience
when reading post pop-ups.

This patch separates the pop-up from the mouse so that this doesn't happen.

js/post-hover.js

@@ -77,6 +77,7 @@ onready(function(){
 						.css('position', 'absolute')
 						.css('font-style', 'normal')
 						.css('z-index', '100')
+            .css('margin-left', '1em')
 						.addClass('reply').addClass('post')
 						.insertAfter($link.parent())