SaVi satellite constellation visualizer savi-dev

Minor tweaks to help intro text to give scripts location.

Notes on the Draim design - there's a Nature paper referencing it.

Removing unneeded global cones_flag

Adding a more explicit hint as to the manual location.

Tweaks to texturemapping text.

Making dynamic texturemapping more visible - if running Geomview, turning it on
will set up the coverage window and render coverage to the sphere.

Noting that multiline comments will mess this optimization up.

Adding 'shades of grey' option useful for black-and-white papers.

only load in small maps if the width matches.

Now that we can switch between no-map random sizes and maps,
back to calloc to make sure memory is clear for when we don't
find a bitmap.