Java reference needs updating

[PUlvestad]

https://www.jmri.org/download/index.shtml
At the bottom of the page in Related Items there is a link directing to Oracle. This should be changed to jmri.org/java

As well, beneath that is reference to CATS. This is really out of date and should be just removed as there are other pages for CATS including Community Connections.

[bobjacobsen]

Done