Exclude all administrative pages

I would like to not display the popup on all administrative pages. I initially used the "exclude paths" textarea with admin/* but it does not work for some specific pages such as node/add/[node-type]. We can, of course, be more restrictive with some url such as node/add/* but it may not always be possible.

My suggestion is to add a checkbox to exclude the popup from all admin pages and use the path_is_admin() function to perform it.

See attached patch.