[imp] 'popup' dialog styling

-set title
-set maximum height only, allowing tighter window for non-overflowing
content
-separate buttons from content, and fix position so they are always visible
[imp] distinguish the delete button from others
[add] list groups and authors
[add] configurable api key path

-remove api version input box as it is fixed by the php client
-disable base path, as it is discarded by the php client