A finite Jacobson space is discrete

Thanks to Keenan Kidwell
http://stacks.math.columbia.edu/tag/04B1#comment-773
http://stacks.math.columbia.edu/tag/038G#comment-775
http://stacks.math.columbia.edu/tag/038I#comment-776
http://stacks.math.columbia.edu/tag/053M#comment-777
http://stacks.math.columbia.edu/tag/07JU#comment-778