SaVi satellite constellation visualizer savi-dev

Removing redundancy.

Minor tweks to README, including stressing geomview -noopengl flag.

Noting lynx use (dependency) for https:// and ftp:/// urls
that are TLE download sources

Improving TLE downloads. We try lynx if simple Tcl http fails (i.e. not 200,
redirect, say) and using lynx means that we can handle https, ftp etc. too.

Removing redundant line

Fixing urls -- TLEs moved from www.celestrak.com to celestrak.org

Updates to packaging procedure.

Altering the cosmetic sunlight hack to inherit from smiulation
constants, as it always should have done.

Improving params handing. params(orbital_period) is time around the Sun.
we create a temporary variable to deal with rotation of a day.

Making Clarke geostationary follow the current stationary
radius set by body parameters.