Added missing file: en/proj/advanced/hr/radial.aspx

This file was missing from the GitHub repository, but I was able to
restore it from the old SVN repository.
Link fixes for ticket 1888

The ticket called for checking the .asp -> .aspx link updates. I checked
all links on the site using the W3C link checker
(http://validator.w3.org/checklink). Found and fixed.
Merge pull request #2 from raddick/develop

Final check of changes to raddick/SkyServer fork before deleting