* Merged in demur's changes adding handling to the thumbnail table for failed thumbnails + functionality to link to the related attachment within the table.
* Fixed warning being thrown when checking "tab" index while generating thumbnail table when the index did not exist.
* Fixed thumbnail table AJAX action being unreliably added. Some systems handled it correctly and others did not. Moving it out of the is_admin() check fixed the issue.
* Other minor styalistic changes.

git-svn-id: https://plugins.svn.wordpress.org/document-gallery/trunk@957734 b8457f37-d9ea-0310-8a92-e5e31aec5664