SaVi satellite constellation visualizer savi-dev

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.

Constellation menu cleanup and categorisation.

More submenus. Now in options-only menu, so we can add different submenu tyoes.