SaVi satellite constellation visualizer savi-dev

Another stab at changing colors without destroying and recreating
entire window - this version finally does that properly.

Coverage shade/levels popup now redraws just the frame-in-frame,
without having to destroy and recreate the coverage window.

Minor tweaks to coverage window geometry for vertically
stretched windows.

Adding an in-verage-window shades control.
This respawns the coverage window, because we haven't
figurd out how to redraw window subelements yet.

More tweaks to Constellations popup menu grouping.

Note on source of parameters - the FCC filing.

Improving packaging notes.

Now that we have submenus, that's off the wishlist.

Forgot to mention the equatorial rings submenu.

updating manual for current use of submenus.