We no longer use jQuery UI for anything since getting
rid of jQuery file uploader in 667a8a63b3b82f3d565f94d254347dfd13da7efa,
so we can safely remove these now.
This reverts commit 2c7906999a6f651ec25f15dd7a6dd11c5e892d68.
The changes break some things in local development (putting JS files
into minified files, not allowing debugger, and others)