Computation of ni variable is using altitude instead of site latitude

[dfil]

When computing ni as:

ni = 6378137.0 / Math.sqrt(1 - 0.00669437999013 * Math.pow(Math.sin(altitude), 2));

It should not be using altitude it should actually be using site latitude as per section 6.1 of the CAT17 Appendix A paper - it mentions a variable L1 and says it should be "calculated once with the formula below using the latitude of the radar".

Uncommenting the latitude parameter and a simple correction to:
ni = 6378137.0 / Math.sqrt(1 - 0.00669437999013 * Math.pow(Math.sin(siteLatitude), 2));
should do the job.