CirclePack Miscellany
* The "HeavyC" libraries are C/C++ libraries which may or may not load
properly. CirclePack retains most of its functionality, nevertheless.
* For computers without middle or right mouse buttons:
use "button1 + ctrl" for middle and "button1 + shift" for right.
* The command "set_display -m" will attempt to optimize the size
of canvasses vis-a-vis the computer screen area available.